sternocleidomastoid synergist and antagonist

a) Zygomaticus major b) Digastric c) Sternohyoid d) Depressor anguli oris. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. A. appall a) temporalis. Synergist: Gluteus maximus, Action: Extends thigh and flexes knee Synergist: Gastrocnemius, Action: Prime mover of dorsiflexion to invert foot The upper fibers are syndergistic with the sternocleidomastoid in head and neck movements and through its rotation of the scapula during glenohumeral movement is an essential part of the "scapulohumeral" rhythm. The arrival times were so different because the airplanes cross(6)\overset{\text{(6)}}{{\underline{\text{cross}}}}cross(6) the International Date Line during the flights. C. Diaphragm. It is given the name sternocleidomastoid because it originates at the manubrium of the sternum (sterno-) and the clavicle (cleido-) and has an insertion at the mastoid process of the temporal bone of the skull.[3]. a) deltoid. B. blasphemy Some studies have indicated a supernumerary cleido-occipital muscle more or less separate from the sterno-cleido-mastoid muscle. Antagonist - muscles that OPPOSE/REVERSE a mov't; Synergist- help prime mover; reducing undesirable/necessary mo't; Fixator - specialized synergist; hold the bone or stabilize origin of P *TRUNK/NECK. antagonist: hamstring muscles, synergist: adductor muscles, gracilis Antagonist: Gluteus maximus [8], The triangle formed by the clavicle and the sternal and clavicular heads of the sternocleidomastoid muscle is used as a landmark in identifying the correct location for central venous catheterization. There are also cases presenting with extra sternal and clavicular heads of origin in SCM.These additional heads, may be unilateral or bilateral and cause significant stenosis of the lesser supraclavicular fossa, imposing complications for anesthesiologists during the anterior central venous catheterization approach. A. Sternocleidomastoid. Treatment for this involves strengthening exercises for the SCM muscle, and repair of the nerve if possible. Synergist: abductor pollicis longus, Action: Flexed thumb Synergist: transverse abdominis, Action: compresses abdominal contents Action: When it is acting superiorly, it elevates the 1st rib as in the process of inhalation; inferiorly, assists in flexion and rotation of the neck. A few fibers of the SCM insert at the bottom of the. The antagonist of the splenius capitis muscle is the Sternocleidomastoid. Churchill Livingstone. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. (a) diaphragm (b) triceps brachii (c) pronator teres (d) flexor carpi ulnaris (e) extensor indicis. Lower: Levator Scapulae. One way to remember which muscle is the agonist - it's the one that's. ibed_guidance published Seeleys essentials of anatomy physiology ( etc.) The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. a. Subscapularis b. Pectoralis major c. Infraspinatus d. Supraspinatus e. Latissimus dorsi, Which of the following muscles is attached to the medial border of the ventral surface of scapula : a-levator scapula b-rhomboides minor c- rhomboides major d-serratus anterior, Which of the following intrinsic muscles of the hand do not make up the thenar eminence? Moore, Keith, L., Dalley, Arthur, F. Clinically Oriented Anatomy. skeletal muscle contracts and pulls on bone. antagonist; adductor group, gracilis, synergist: gluteus medius and tensor fasciae latae KenHub. e) latissimus dorsi. This muscle binds the skull to the sternum and clavicle. Scalenes, opposite side of splenius capitis, Anterior,Medial, and Posterior Transverse Processes of the Cervical Vertabrae, Bilaterally: Elevate the ribs during Inhalation (ALL), Posterior neck muscles/ extensors opposite scalenes, External occipital protuberance, medial portion of superior nuchal line of the occiput. Bilaterally: Extend head and neck Lower: Depress the scapula, upwardly rotate the scapula, Upper: Levator scapula, serratus anterior, SCM, Michael Menna, DO, is a board-certified, active attending emergency medicine physician at White Plains Hospital in White Plains, New York. Which of the following muscles is most active during extension of the arm/glenohumeral joint? Synergist: Gastrocnemius, Action: Flexes toes Enterta[in]ing as I do, the most confident hope of succeeding in a voyage which had formed a (7) da[r]ling project of mine for the However, you may visit "Cookie Settings" to provide a controlled consent. Clavo-Trapezius, Acromio-Trapezius, Spino-Trapezius, Pectoralis Minor, Levator Scapulae, Serratus . d) biceps brachii. In this case, it lifts up the breastbone and the area of the collarbones that are nearest to the midline of the body. The muscle that is contracting is called. A) Coracobrachialis B) Tricep Brachi C) Latissimus dorsi D) Pectoralis major E) Supraspinatus, Which of the following muscles is an important elevator of the scapula? a. platysma b. occipitalis c. sternohyoid d. mylohyoid. Which of the following muscles is used in breathing? Verywell Health's content is for informational and educational purposes only. Philadelphia: Lea and Febiger, 1918; Bartleby.com, 2000. We also use third-party cookies that help us analyze and understand how you use this website. The SCN can produce several different neck movements. a) Clavicle b) Cervical vertebrae c) Scapula d) Sacrum. It is partially covered by the gluteus maximus. Antagonist: One side can contract, or both sides can contract. Sternocleidomastoid --- Splenius Capitis Preview this quiz on Quizizz. Synergist: Extensor carpi radialis longus, Action: Extends and adducts wrists a. Longissimus. Which of these muscles is located on the ventral (anterior) side of the body? Which of the following muscles is not innervated by the median nerve? Synergist: Platysma, Action: Flexes neck forward when together It also acts as an accessory muscle of respiration, along with the scalene muscles of the neck. Abnormal head positioning in utero or difficult birth can lead to development of the compartment syndrome and congenital muscular torticollis sequela.Acquired SCM torticollis, can be post traumatic, myopathy induced, post infectious, drug induced, neurological or following sudden strenuous neck muscle activity. The muscle primarily responsible for a movement is called the prime mover, and muscles that assist in this action are called synergists. Nerve Supply: Cervical nerve 7. They assist the SCM in turning and tilting both the head and neck. The number of these extra clavicular slips may vary and such occurrence may be unilateral or bilateral. Antagonist: Digastric Antagonist: Flexor carpi ulnaris Synergist: Abductor pollicis longus, Action: forearm flexor Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. (a) the erector spinae (b) the rhomboid group (c) the splenius group (d) the scalenes (e) the transversospinalis. In the case of the sternocleidomastoid muscle, it is innervated by the accessory nerve (cranial nerve XI). We were now about to penetrate a country at least two thousand miles in width, on which the foot of civilized man had never (3) trodden; the good or evil it had in store for us was for experiment yet to determine, and these little vessells contained every article by which we were to expect to (4) subsist or defend ourselves. The scalenes are synergist muscles, or helper, muscles to the sternocleidomastoid. synergist that assists an agonist by preventing or reducing movement at another joint, thereby stabilizing the origin of the agonist flexion movement that decreases the angle of a joint fulcrum an axis of rotation, like a joint fusiform muscle that has fascicles that are spindle-shaped to create large bellies insertion Which of the following muscles does not attach to the humerus? The internal carotid artery to reach both the sternocleidomastoid muscles and the trapezius. The International Date Line lays(8)\overset{\text{(8)}}{{\underline{\text{lays}}}}lays(8) between two time zones in the Pacific Ocean. [5][6] It supplies only motor fibres. Together, they function in swallowing, chewing, and speech, serve as important surgical landmarks in neck dissections and are used routinely for reconstruction. Antagonist: extensor carpi radialis longus Sternocleidomastoid --- Splenius Capitis. A coexisting unilateral absence of SCM with the ipsilateral absent trapezius is an extremely rare variation and till date, only about three such reports are present in literature .Such cases present with cosmetic and functional impairment and are best diagnosed by Magnetic Resonance Imaging scans. Antagonist: deltoid Antagonist: Gastrocnemius B. Abdominal. a) orbicularis oris b) platysma c) orbicularis oculi d) sternocleidomastoid, What muscle is directly lateral to the sternohyoid? The sternocleidomastoid muscle is a two-headed neck muscle, which true to its name bears attachments to the manubrium of sternum (sterno-), the clavicle (-cleido-), and the mastoid process of the temporal bone (-mastoid). When acting alone it rotates to the opposite side (contralaterally) and slightly (laterally) flexes to the same side. Other functions of the SCM include assisting in breathing, maintaining neck posture, and helping the temporomandibular joint (TMJ) function. The positive effects of physical activity and exercise on almost all functions of the human body are widely acknowledged. Synergist: Masseter, Action: Flex & Rotate neck (Select all that apply.) Synergist: Gluteus maximus, Action: Medially rotates leg at thigh These muscles also support and provide protection for the internal structures of the neck. The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck. The scalenes are synergist (helper) muscles to the SCM. C. censure Would you show Carl and him the photograph? We describe the main muscle that does an action as the agonist. This can cause atrophy (shrinking) in the affected SCM and may cause difficulty in turning the head and bending the neck. supraclavicularis muscle [3] When both sides of the muscle act together, it flexes the neck and extends the head. Synergist muscles work along with agonist muscles to create motion analogous to or in conjunction with agonist muscles, allowing for a wide range of conceivable motions. When one side acts alone, it causes the head to rotate to the opposite side and flexes laterally to the same side (ipsilaterally). Which of these muscles is the prime mover of elbow extension? See examples of antagonist muscles. antagonist: adductor group, gracilis, synergist: gluteus medius, gluteus minimus, gluteus maximus d) lateral pterygoid. Synergist: supinator, Action: Stabilizes wrist Frowning (antagonist of zygomaticus) Orbicularis oris Indirectly from maxilla/mandible, fibers blend. antagonist: erector spinae muscles, synergist: rectus abdominis, internal oblique antagonist: tensor fasciae latae, gluteal minimus, medius muscles, synergist: gastrocnemius Congenital torticollis can have an unknown cause or result from birth trauma that gives rise to a mass or tumor that can be palpated within the muscle. Benign fibrosis, hypoplasia or aplasia of SCM is the most common cause of congenital torticolis. a) Flexor pollicis longus b) Vastus medialis c) Rectus femoris d) Soleus e) Gluteus maximus, Which of the following elbow flexor muscles is also a forearm supinator? Antagonist: Gracilis Synergist: pectoralis major, Action: Extends and medially rotates humerus 3. d) buccinator. They may not cause any functional advantage or disadvantage in neck movement but might be physically interfering during invasive procedures. a. Levator scapulae b. Pectoralis minor c. Rhomboid d. Serratus anterior e. Trapezius, Which of the following muscles is a rotator cuff muscle? The sternocleidomastoids (SCMs) are superficially located neck muscles that play an important role in tilting your head and turning your neck, as well as other movements. Rotation of the head to the opposite side or obliquely rotate the head. A neck extension movement that takes place at your first. Antagonist: external intercostals This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics". The SCM is part of a group of muscles known as the anterolateral neck flexors. Examination of the sternocleidomastoid muscle forms part of the examination of the cranial nerves. Synergist: external intercostals. Synergist: Gastrocnemius, Action:Flexes big toe Just check all flip PDFs from the author ibed_guidance. More rarely, the adjoining margins of the sternocleidomastoid and trapezius are in contact. For example, the scalenes are synergist muscles to the sternocleidomastoids (SCM), because they help with turning and tilting the head and neck. Definition The gluteus medius is one of four superficial gluteal muscles that allow a broad range of movement in the hip joint. J. Ashton . All other trademarks and copyrights are the property of their respective owners. antagonist: tensor fasciae latae and gluteal muscles, synergist: hamstring muscles, gracilis, gastrocnemius, and sartorius antagonist: quadriceps femoris muscles, synergist: soleus Antagonist: Biceps femoris d. Splenius. LAB 5 Muscle I Axial Muscular System Objectives: To know the primary functions of the muscular system. a) sternocleidomastoid b) orbicularis oculi c) trapezius d) platysma, Which muscle acts to anchor the scapula? These cookies track visitors across websites and collect information to provide customized ads. By clicking Accept All, you consent to the use of ALL the cookies. Synergist: NA, Action: Planatar flexion when knee is extended Unilaterally: Elevate the scapula, downwardly rotate scapula, laterally flex the head and neck, rotate the head and neck, Spinous processes of all vertebrae except C-1, Bilaterally: Extend the vertebral column Middle: Pectoralis minor, serratus anterior Synergist: pectineus, Action: extends knee D. Pectoralis minor. An impairment or injury to the spinal accessory nerve can cause weakness or paralysis to the SCM. It travels superiorly, laterally, and posteriorly. Which of the following muscles is a rotator cuff muscle? Contraction of the muscle gives rise to a condition called torticollis or wry neck, and this can have a number of causes. Finally, look up each word in the dictionary and record the definitions on the lines below. L. languish Which muscle acts as an agonist with the teres minor during lateral rotation of the shoulder? Which muscle depresses the clavicle and stabilizes the pectoral girdle? Variations Of The Sternocleidomastoid Muscle: A Literature Review. A. Biceps brachii B. Brachialis C. Brachioradialis D. Triceps brachii, Which of the following muscles provides the greatest contribution to lateral rotation of the shoulder joint? Which of the following does not attach to the corocoid process of the scapula? When refering to evidence in academic writing, you should always try to reference the primary (original) source. Edit. Like Seeleys essentials of anatomy physiology ( etc.)? Sternal Head:Upper part of the anterior surface of the manubrium Anatomical Attachments: Origin: The Sternal head attaches to the manubrium of the sternum; the Clavicular head attaches to the medial third of the clavicle. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. 0. Synergist: NA, Action: rotates and adducts scapula (a) What does the king specify as his wish for Mari Djata? Cookies collect information about your preferences and your devices and are used to make the site work as you expect it to, to understand how you interact with the site, and to show advertisements that are targeted to your interests. The glenohumeral joint receives extra support from the rotator cuff muscles. By clicking Accept, you consent to the use of ALL the cookies. Developmentally, these additional muscle slips indicate abnormal mesodermal splitting in posterior sixth branchial arch. Head and neck to opposite side, elevate the scapula, upwardly rotate the scapula Together they allow normal posturing of the head and neck referred to as an "elongated neck with chin tuck." Together, these muscles provide flexion of the elongated . The infrahyoid muscles are also part of a . The two heads are separated from one another at their origins by a triangular interval (lesser supraclavicular fossa) but gradually blend, below the middle of the neck, into a thick, rounded muscle which is inserted, by a strong tendon, into the lateral surface of the mastoid process, from its apex to its superior border, and by a thin aponeurosis into the lateral half of the superior nuchal line of the occipital bone. for free. Muscle overlays on the human body. Lippincott, Williams and Wilkins. It is also known as SCM or Sternomastoid or Sterno muscle. Meanwhile, a muscle with the opposite action of the prime mover is called an antagonist. Antagonist Muscles On the opposite side of the body from the multifidus and erector spinae are the abdominal muscles. Which muscle acts as a synergist with pectorals minor during abduction of the scapula? The sternocleidomastoid muscle is one of the largest and most superficial cervical muscles. Synergist: sartorious, Action: adducts, flexes and medially rotates thigh A) The sternocleidomastoid is the prime mover, and the splenius cervicis is the fixator. Synergist: gluteus maximus, Action: extends knee and stabilizes it During elbow flexion where the bicep is the agonist, the tricep muscle is the antagonist. Platysma - single sheetlike; covers anterolateral neck; Sternocleidomastoid - paired muscle; PRAYER MUSCLE b) masseter. It is thick and thus serves as a primary landmark of the neck, as it divides the neck into anterior and posterior cervical triangles (in front and behind the muscle, respectively) which helps define the location of structures, such as the lymph nodes for the head and neck.[8]. Synergist: Pronator teres, Action: Extends and abducts wrist Which of the following muscles is completely superficial? Which one? load is the weight of the object. Synergist: Tibialis anterior, Action: Stabilizes trunk Sternothyroid is a paired strap muscle located in the muscular triangle of the neck.It is a part of a group of muscles called the infrahyoid muscles.There are four such muscles that are grouped into superficial and deep layers. Antagonist: Sartorious skeletal muscle is attached to bone at origin and insertion. Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Get Top Tips Tuesday and The Latest Physiopedia updates, The content on or accessible through Physiopedia is for informational purposes only. are found Synergists prevent movement ot the inter-in the large trunk and thigh muscles, . Differentiate between: a. Torticollis is a movement disorder in which the head is persistently turned to one side. a) frontalis. Ligamentum nuchae and spinous processes of C7-T12, Lateral 1/3 of clavicle, Acromion Process and spine of the scapula, Upper: Bilaterally- Extend the head and neck Acetylcholine (ACH) is released from vesicles and is sent over the synaptic cleft to receptors on the postsynaptic bulb. The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck. Antagonist: NA These cookies will be stored in your browser only with your consent. 83% average accuracy. a. supraspinatus b. rhomboids c. deltoid d. infraspinatous. The absence of SCM cover may lead to complicated congenital neck hernias in children, in addition to functional limitations. What is the antagonist muscle in elbow flexion? The Sternocleidomastoid is an anterior muscle of the neck. Antagonist: infraspinatus Antagonist: abductor pollicis longus Synergist: Tensor fascia latae, Action: Extends thigh Necessary cookies are absolutely essential for the website to function properly. The supraclavicularis muscle arises from the manubrium behind the sternocleidomastoid and passes behind the sternocleidomastoid to the upper surface of the clavicle. Contralateral rotation of the head and cervical spine when acting unilaterally. There are reports of a broad clavicular head splitting into multiple small muscular slips. Which of the following muscles is primarily a postural muscle? Synergist: Biceps brachii, Action: Pronates forearm Synergist: psoas, Action: adducts thigh Which of the following muscles performs cervical extension only? Antagonist: pronator teres Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Synergist muscles help other muscles perform one or more functions. Synergist: Splenius, Action: adducts and medially rotates arm a. Levator scapulae b. Pectoralis minor c. Rhomboid d. Serratus anterior e. Trapezius. Clavo-trapezius (posterior; superior to acromio-trapezius) . These cookies ensure basic functionalities and security features of the website, anonymously. c) pectoralis major. a. triceps brachii b. pronator quadratus c. adductor pollicis d. flexor carpi radialis e. abductor pollicis brevis, Which of the following muscles is a lateral rotator of the arm? Antagonist: deltoid This extra triangle can also be considered as an extended lesser supraclavicular fossa which normally separates the sternal and clavicular heads of origin of SCM. A contraction of both SCM muscles can flex your neck, which brings your chin down in the direction of your breastbone. Become a Study.com member to unlock this answer! Which of the following muscles is part of the rotator cuff? Antagonist: gluteus maximus What is the function of the sternocleidomastoid muscles? I give my consent to Physiopedia to be in touch with me via email using the information I have provided in this form for the purpose of news, updates and marketing. 9th - 12th grade. Strap-like; e.g., sternocleidomastoid Or: Synergist: gluteus maximus, Action: adducts and medially rotates arm Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Antagonist: Flexor carpi radialis Synergist: NA, Action: Forearm supinator E. Scalenes. Synergist: Supinator, Action: Extends and flares fingers ). Antagonist: Tibialis anterior Which of the muscles is involved in the pronation of the forearm? Fifth Edition. Synergist: serratus anterior, Action: Moves scapula towards chest wall The SCM inserts behind the ear at the mastoid process, a projection of the. a) Biceps brachii muscle b) Pronator teres c) Flexor carpi radialis d) Brachialis. Explore antagonistic muscles. The supraclavicularis muscle arises from the manubrium behind the sternocleidomastoid and passes behind the sternocleidomastoid to the upper surface of the clavicle. Unilaterally: Rotation of head to the opposite side, lateral flexion of the neck on the same side Read more, Physiopedia 2023 | Physiopedia is a registered charity in the UK, no. Which of the following muscles flexes the neck? Muscles that Act on the Scapula . A. rectus abdominis B. transversus abdominis C. erector spinae D. latissimus dorsi. Cook, were still viewed by us with as much pleasure as those deservedly famed adventurers ever ( 2 ) beheld theirs; and I dare say with quite as much anxiety for their safety and preservation. Action: Pulls lower lip down to expose lower teeth, Action: Pulls corners of mouth down and lateral, Action: Compresses cheeks as in whistling, Action: Primer mover to close jaw The SCM continues on to attach to the mastoid bone. StatPearls. In most cases Physiopedia articles are a secondary source and so should not be used as references. roberta snider hartville ohio obituary la dissolution est une transformation chimique ou physique i would appreciate any feedback you can provide carbon nation tribe . Read the flipbook version of Seeleys essentials of anatomy physiology ( etc.). Other functions of the SCM include assisting in breathing, maintaining neck posture, and helping the temporomandibular joint (TMJ) function. Antagonist: Adductor mangus The world divides(7)\overset{\text{(7)}}{{\underline{\text{divides}}}}divides(7) into 242424 time zones so that the sun is high in the sky at noon almost everywhere on earth. The following passage is from a journal kept by Meriwether Lewis and William Clark during their heralded exploration of the American West. Synergist: Extensor digitorium, Action: Powerful arm extensor By Anne Asher, CPT Such a phenomenon describes Sinohara's law of separation which states that two muscles( SCM and trapezius ) having common nerve supply ( accessory nerve ) are derived from a common muscle mass8. On either side, the SCM diagonally divides the neck musculature into anterior (front) and posterior (back) triangles. It is shown that localized muscle pain can reorganize the EMG activity of synergists where no pain is present, and this findings may have implications for the understanding of manifestations seen in relation to painful musculoskeletal disorders. [4], They arise from the anterolateral surface of the manubrium sterni and the medial third of the superior surface of the clavicle, respectively. a. Biceps brachii b. Triceps brachii c. Jaw d. Tongue. Lateral flexion of the head and cervical spine when acting unilaterally Antagonist: Sartorious "offense, offence". A. Brachialis B. Deltoid C. Triceps Brachii D. Brachioradialis E. Trapezius. b) triceps brachii. . Origin: An aponeurosis is a broad flat expanse of tendon. synergist: sternocleidomastoid, rhomboids supraspinatus synergists: middle deltoid and infraspinatus antagonist: pectoralis major, latissimus dorsi, teres major indirect object. Antagonist: adductor mangus [2] Itprotects the vertical neurovascular bundle of neck, branches of cervical plexus, deep cervical lymph nodes and soft tissues of neck from damage[2], Image: Sternocleidomastoid muscle (highlighted in green) - anterior view[3], This 2 minute video is a good summary of the sternocleidomastoid muscle. Antagonist: Masseter The Anatomy of the Brachiocephalic Artery, Superficial Layer of the Intrinsic Back Muscles, Causes of Collarbone Pain and Treatment Options, Hamstring Muscles: Anatomy, Function, and Common Injuries, spinal accessory nerve (cranial nerve 11), Anatomy, head and neck, sternocleidomastoid muscle. Antagonist: tensor fascia latae But opting out of some of these cookies may affect your browsing experience. Muscles that work like this are called antagonistic pairs. 5- 10 reps/ 1-2 seconds Dynamic Stretching . (a) Latissimus dorsi (b) Infraspinous (c) Supraspinous (d) Subscapularis. antagonist: triceps brachii, synergist: external and internal obliques The sternocleidomastoid is innervated by the accessory nerve . a) Gluteus maximus b) Iliopsoas c) Extensor hallucis longus d) Lumbricals e) Dorsal interosseous, Which of the following muscles acts primarily to plantarflex toes 2-5? In the Middle Ages, when the Catholic Church was all-powerful, a(n) The sternocleidomastoid muscle has a cylindrical, strap-like shape that emerges from the side of your neck and tapers at the ends. Antagonist: Sartorious Edit. Study with Quizlet and memorize flashcards containing terms like Buccinator Synergist, Buccinator Antagonist, Frontalis Antagonist and more. (I bought one thing for Dad. [medical citation needed]. process of using agonist and synergist to dynamically move the joint into range of motion. a) trapezius b) levator scapula c) serratus anterior d) latissimus dorsi. Innervation is when an organ or body part is supplied with nerves. antagonist; erector spinae, synergist: hamsting muscles What is the antagonist muscle in elbow flexion? b) orbicularis oris. B. Synergist: Supinator, Action: Abducts and extends thumb Get access to this video and our entire Q&A library. This cookie is set by GDPR Cookie Consent plugin. . Antagonist: Tibialis posterior The muscle that is contracting is called the agonist and the muscle that is relaxing or lengthening is called the antagonist. In many animals, the cleidomastoid belly is distinctly separate from the sternomastoid belly. Protrusion-Retrusion involves the movements of _______ muscle. Unilaterally: Rotate the vertebral column, Lab 17 & 18 Action, Synergist, Antagonist, Head and Neck Muscles - Action, Antagonist, S, Byron Almen, Dorothy Payne, Stefan Kostka, The Language of Composition: Reading, Writing, Rhetoric, Lawrence Scanlon, Renee H. Shea, Robin Dissin Aufses, John Lund, Paul S. Vickery, P. Scott Corbett, Todd Pfannestiel, Volker Janssen, 1103 - Ch 5: Muscles of the Head, Neck & Face, Micro Exam Chapter 6/7/9 and Chart of Names (. Upper region of medial border and superior angle of scapula. chest press -> rotator cuff Antagonist .