The sternocleidomastoid muscle originates from two locations: the manubrium of the sternum and the clavicle. Contralateral rotation of the head and cervical spine when acting unilaterally. Rotation, retraction, elevation, and depression of scapula, serratus anterior muscle, Latissimus dorsi, Pectoralis Major. The SCM muscle helps turn and bend your neck. For beginning and intermediary anatomy . Synergist: Pectoralis major Antagonist: Spino-deltoid. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking Accept, you consent to the use of ALL the cookies. 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. Antagonist: gluteus maximus a. supraspinatus b. rhomboids c. deltoid d. infraspinatous. 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]. About a dozen cases have reported complete unilateral absence of the muscle. b) masseter. Which of the following is the term that describes the relation of brachioradialis to biceps brachii during forearm flexion? scalenes 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: diaphram Antagonist: Extensor carpi ulnaris Middle: Rhomboids, spine extensors ), In American English, words ending in the sound ens are usually spelled with -nce, as in reverence. For each verb form that is underlined, choose the letter of the best revision. Kapandji, I.A., "The Physiology of the Joints". 83% average accuracy. The Internet Journal of Human Anatomy, 2010, Kaur D et al. Some authors regard such fusions to be a normal developmental feature , due to their common derivation from the post- sixth branchial arch. For example, the scalenes are synergist muscles to the sternocleidomastoids (SCM), because they help with turning and tilting the head and neck. A few fibers of the SCM insert at the bottom of the. d) occipitalis. Spinal accessory nerve (XI), with sensory supply from C2 & C3 (for proprioception), Sternocleidomastoid branch of the Occipital artery, Draws the mastoid process down toward the same side which causes the chin to turn up toward the opposite side; acting together, the muscles of the two sides flex the neck. Thank you, {{form.email}}, for signing up. This muscle binds the skull to the sternum and clavicle. Antagonist: Splenius Synergist: Platysma Sternocleidomastoid Action: Flexes neck forward when together Antagonist: Temporalis Synergist: Scalenes Flickr Creative Commons Images Some images used in this set are licensed under the Creative Commons through Flickr.com. synergist and antagonist musclesnixon high school yearbooks synergist and antagonist muscles. a) triceps brachii b) brachialis c) brachioradialis d) coracobrachialis e) anconeus, When the biceps brachii flexes, what is the antagonist? The Wellness Digest's content is for informational purposes only. Synergist: sartorious, Action: adducts, flexes and medially rotates thigh Recognizing Compound Indirect Objects. Synergist: vastus lateralis, Action: extends knee Edit. c) pectoralis major. During elbow flexion where the bicep is the agonist, the tricep muscle is the antagonist. (b) The glenohumeral joint allows for movement in which dimensions? They assist the SCM in turning and tilting both the head and neck. antagonist: deltoid, teres minor, infraspinatus, synergist: pectoralis major and serratus anterior, synergist: latissimus dorsi, subscapularis, teres major, biceps brachii, latissimus dorsi, deltoid, synergist: pectoralis minor antagonist: tensor fasciae latae, gluteal minimus, medius muscles, synergist: sartorius Antagonist: triceps brachii When both SCM muscles contract, the movements can include: Simultaneous bilateral SCM muscle contraction also plays a role in the breathing process. The information provided on this site is not a substitute for a physical consultation with a medical professional. Sternocleidomastoid. These cookies do not store any personal information. a. coracobrachialis b. latissimus dorsi c. levator scapulae d. pectoralis minor, Which of the following muscles is responsible for scapular elevation, retraction, and downward rotation? Middle: Adduct the scapula, stabilize the scapula The SCM inserts behind the ear at the mastoid process, a projection of the. Sternocleidomastoid: Sternocleidomastoid: Rectus Abdominus: Erector Spinae Group: Origin: where muscle meets bone that doesn't move-proximal: Insertion: where muscle meets bone that does move-distal: Agonist: muscle that contracts: Antagonist: muscle that relaxes: Synergist: muscle that also contracts to aid agonist: Fixator F. edifice Which of the following muscles is not innervated by the median nerve? Synergist: deltoid, Action: Forearm flexor Our vessels consisted of six small canoes, and two large (1) pirogues. 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. antagonist: triceps brachii, synergist: biceps brachii Sternocleidomastoid is the most superficial and largest muscle in the front portion of the neck. A. a. Levator scapulae b. Pectoralis minor c. Rhomboid d. Serratus anterior e. Trapezius. It covers the anterior surface of the neck superficially. (d) Segmental branches. Synergist: rectus femoris, Action: Extends knee and stabilizes it. Antagonist: Extensor digitorium longus a. teres major b. infraspinatus c. latissimus dorsi d. subscapularis, Which of the following muscles does not exert a force on the upper extremity during contraction? A. Pronator teres B. Flexor carpi radialis C. Brachioradialis D. Flexor carpi ulnaris E. Biceps brachii. a. Pectoralis minor b. Subscapularis c. Rhomboid d. Trapezius, Which of the following muscles has two heads? Along the muscle fibers are t-tubule openings which facilitate the spread of the action potential into the muscle fibers. All rights reserved. e) latissimus dorsi. [3][4] The sternocleidomastoid is thick and narrow at its centre, and broader and thinner at either end. 9th - 12th grade. Such cases represent the developmental defect of muscular agenesis and are diagnosed by Ultrasound or Magnetic Resonance Imaging scans. Synergist: supraspinatus, Action: Pulls shoulders medially Extension of the head and cervical spine when posterior fibers act bilaterally, 2. Which muscle acts as a synergist with pectorals minor during abduction of the scapula? The thickness of the CH is variable. Synergist: Extensor hallucis longus, Action: Prime mover of toe extension C. The sternocleidomastoid is the prime mover and the splenius cervicis is the antagonist. Treatment for this involves strengthening exercises for the SCM muscle, and repair of the nerve if possible. Antagonist: external intercostals process of using agonist and synergist to dynamically move the joint into range of motion. An excellent book for those beginning the study of anatomy. 3 months ago. What are various methods available for deploying a Windows application? Flexion of the head and cervical spine when anterior fibers act bilaterally Agonists: Longus Capitis Antagonists: Longissimus Capitis Spinalis Capitis Splenius Capitis Semispinalis Capitis Sternocleidomastoid (posterior fibers) 3. Anatomy of the Human Body. Synergist: flexor pollicis longus, Action: abducts hand a. Digastric b. Mylohyoid c. Omohyoid d. Sternocleidomastoid. D. cognizant The fibers from the accessory nerve nucleus travel upward to enter the cranium via the foramen magnum. 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. Which of the following muscles is part of the rotator cuff? Because drugs manifest their action via their targets, the effects of drug combinations should depend on the interaction of their targets in a network manner. Synergist: Tensor fascia latae, Action: Extends thigh Clark myself the two Interpretters and the woman [Sacajewea] and the child sleep in a tent of dressed skins. Antagonist: Psoas (adsbygoogle = window.adsbygoogle || []).push({}); For Pain and Symptom Information See: Sternocleidomastoid Muscles: Head, Eyes, Sinus, Ears, Throat Pain. synergist: sternocleidomastoid, rhomboids, synergists: middle deltoid and infraspinatus, synergist: teres minor, subscapularis, supraspinatus, deltoids, synergist: deltoid, pectoralis major, latissimus dorsi, subscapularis, synergist: rhomboids, pectoralis major, teres major, synergist: supraspinatus and pectoralis major (for flexion) Synergist: Tibialis posterior, Action: Keeps foot flat on ground 3 What is the antagonist muscle in elbow flexion? Antagonist: Sternocleidomastoid; Longus colli and capitis; Scalenus anterior, . Unilaterally- Laterally Flex the head and neck, rotate. Other functions of the SCM include assisting in breathing, maintaining neck posture, and helping the temporomandibular joint (TMJ) function. Which of the following muscles flexes the neck? a. Anterior deltoid b. Synergist: Masseter, Action: Flex & Rotate neck Antagonist: Tibialis posterior Which of the following muscle is found in the head? Lower: Serratus anterior, pectoralis minor, spine extensors, Upper: Rhomboids, neck flexors It is sometimes also called the "prime mover". Necessary cookies are absolutely essential for the website to function properly. It IS NOT medical advice. Antagonist: Digastric Which of these muscles is the prime mover of elbow extension? 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 Synergist: NA, Action: Planatar flexion when knee is extended It can also occur with certain health conditions, such as asthma and. The clavicular origin of the sternocleidomastoid varies greatly: in some cases the clavicular head may be as narrow as the sternal; in others it may be as much as 7.5 millimetres (0.30in) in breadth. Muscle overlays on the human body. ibed_guidance published Seeleys essentials of anatomy physiology ( etc.) The cookie is used to store the user consent for the cookies in the category "Analytics". . However, as the state of mind in which we are, generally gives the (5) colouring to events, when the imagination is (6) suffered to wander into futurity, the picture which now presented itself to me was a most pleasing one. Strap-like; e.g., sternocleidomastoid Or: 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 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. Advertisement Middle Trapezius Synergist: gluteus maximus, Action: adducts and medially rotates arm The antagonist of the splenius capitis muscle is the Sternocleidomastoid. Synergist: Splenius, Action: adducts and medially rotates arm The ACH causes the resting potential to increase above -55mV, thus initiating an action potential which travels along the muscle fiber. Antagonist: abductor pollicis longus StatPearls. Synergist: flexor carpi radialis, Action: Arm abduction Share and download Seeleys essentials of anatomy physiology ( etc.) Antagonist: deltoid The muscle primarily responsible for a movement is called the prime mover, and muscles that assist in this action are called synergists. The SCM continues on to attach to the mastoid bone. antagonist: tensor fasciae latae, gluteal minimus, medius muscles, synergist: gastrocnemius It also acts as an accessory muscle of inspiration. The number of these extra clavicular slips may vary and such occurrence may be unilateral or bilateral. Antagonist: tensor fascia latae A. biceps brachii B. brachialis C. brachioradialis D. triceps brachii, Which of the following muscles is a developmentally dorsal muscle of the upper limb? The muscle allows the head and vertebrae to extend. When it contracts, it produces a slight wrinkling of the neck, and a "bowstring" effect on either side of the neck. (a) Latissimus dorsi (b) Infraspinous (c) Supraspinous (d) Subscapularis. Antagonist: Tensor fascia latae To define the origin, insertion, and belly of a skeletal muscle. This tent is in the Indian stile formed of a number of (8) dressed Buffaloe skins sewed together with sinues. 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. kleine weie friedenstaube text und noten. [medical citation needed]. Sternocleidomastoid and the Scalenes are Synergists, which mean that they work together to provide the same movements (flexion, rotation and lateral flexion of the head and neck)An Antagonist is a . b) triceps brachii. Unilaterally: contralateral cervical rotation, ipsilateral cervical flexion These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The other muscles in the anterolateral neck flexor group are the scalenes, which are located more deeply in the neck than the SCM. Variations Of The Sternocleidomastoid Muscle: A Literature Review. [7], The sternocleidomastoid is within the investing fascia of the neck, along with the trapezius muscle, with which it shares its nerve supply (the accessory nerve). Vascular supply: Muscular branches of the ascending Cervical artery. Antagonist: pronator teres Antagonist: extensor carpi ulnaris Drug combinations may exhibit synergistic or antagonistic effects. When you visit the site, Dotdash Meredith and its partners may store or retrieve information on your browser, mostly in the form of cookies. Sternocleidomastoid and the Scalenes are Synergists, which mean that they work together to provide the same movements (flexion, rotation and lateral flexion of the head and neck)An Antagonist. Which of the following muscles is responsible for elevating the eyebrows? The movement of troponin and tropomyosin is key in facilitating the myosin head to move along the thin filament, resulting in a contraction of the sternocleidomastoid muscle. Platysma - single sheetlike; covers anterolateral neck; Sternocleidomastoid - paired muscle; PRAYER MUSCLE Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Synergist: Brachioradialis, Action: Extends thumb Meanwhile, a muscle with the opposite action of the prime mover is called an antagonist. antagonist; adductor group, gracilis, synergist: hamstring muscles and gracilis Peripheral Nerve Surgical Procedures for Cervical Dystonia", "64 Cranial Nerve XI: The Spinal Accessory Nerve", https://en.wikipedia.org/w/index.php?title=Sternocleidomastoid_muscle&oldid=1134499511. Synergist: trapezius, Action: hip flexor The form of a muscle that stabilizes the origin of the prime mover so that it can act more efficiently is called the: a. synergist b. agonist c. antagonist d. fixator e. secondary mover The muscles of ____ lie within the subcutaneous layer, originating on the fascia or bones of the _____ and inserting into the _____. This cookie is set by GDPR Cookie Consent plugin. However, there are many common except ions end ing with -nse, such as suspense. In an antagonistic muscle pair, as one muscle contracts, the other muscle relaxes or lengthens. The sternocleidomastoid is the prime mover and the splenius cervicis is the fixator. By Anne Asher, CPT Middle deltoid c. Posterior deltoid d. Superior deltoid, Which shoulder joint muscle is associated with humeral abduction, flexion, horizontal adduction and internal rotation? "5. Which of the following muscles performs cervical extension only? a) pronator teres b) extensor carpi radialis longus c) Biceps brachii d) Triceps brachii, Which of the following muscles helps to open the mouth (depress the mandible)? Agonist is deltoid, antagonist is the latissimus dorsi. Synergist: Gastrocnemius, Action: Flexes and rotates medially (a) Biceps brachii (b) Latissimus dorsi (c) Pectoralis major (d) Subscapularis. Together, they function in swallowing, chewing, and speech, serve as important surgical landmarks in neck dissections and are used routinely for reconstruction. 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). Synergist: Sarotious, Action: Abducts and medially rotates thigh Synergist: Extensor digitorium, Action: Powerful arm extensor Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Moore, Keith, L., Dalley, Arthur, F. Clinically Oriented Anatomy. Treatment involves physiotherapy exercises to stretch the involved muscle and strengthen the muscle on the opposite side of the neck. It was concluded that acute muscle pain is unable to maintain longerlasting resting muscle hyperactivity. MedlinePlus, U.S. National Library of Medicine. All other trademarks and copyrights are the property of their respective owners. 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: extensor carpi radialis longus The supraclavicularis muscle arises from the manubrium behind the sternocleidomastoid and passes behind the sternocleidomastoid to the upper surface of the clavicle. Synergist: Supinator, Action: Extends and flares fingers Then slowly reread the passage, writing your own definition for each italicized word. Synergists and Antagonists Synergists - are groups of muscles working together to cause movement A. abductor pollicis brevis B. flexor pollicis longus C. medial heads of flexor digitorum profundus D. superficial head of flexor pollicis brevis E. pronator quadratus, Which of the following muscles are innervated by the trigeminal nerve? Synergist: pectoralis major, Action: medial rotation of shoulder Etymology and location [ edit] (a) Deltoid (b) Teres major (c) Infraspinatus (d) Coracobrachialis (e) Trapezius. Bordoni B, Varacallo M. Anatomy, head and neck, sternocleidomastoid muscle. Which of the following does not attach to the corocoid process of the scapula? _____ was likely to be burnt at the stake. Antagonist: Sartorious sternocleidomastoid synergist and antagonist The sternocleidomastoid is innervated by the accessory nerve. Use each word once. Createyouraccount. More rarely, the adjoining margins of the sternocleidomastoid and trapezius are in contact. a) sternocleidomastoid b) orbicularis oculi c) trapezius d) platysma, Which muscle acts to anchor the scapula? joint act as a fulcrum. The biceps brachii functions to pull the radius of the lower arm toward the body. Head and neck to opposite side, elevate the scapula, upwardly rotate the scapula Synergist: supinator, Action: Stabilizes wrist I bought Dad^a screwdriver set for Christmas. The accessory nerve nucleus is in the anterior horn of the spinal cord around C1-C3, where lower motor neuron fibers mark its origin. Also, the muscle works with the scalene muscles in the neck during forced inspiration while breathing. Physiopedia is not a substitute for professional advice or expert medical services from a qualified healthcare provider. The supraspinatus and infraspinatus muscles have the main part of their body attached to which of the following bone? Origin: You can find out more about our use, change your default settings, and withdraw your consent at any time with effect for the future by visiting Cookies Settings, which can also be found in the footer of the site. Antagonist: infraspinatus Which of the following muscles acts to protract the mandible? Antagonist: Palmaris longus A contraction of both SCM muscles can flex your neck, which brings your chin down in the direction of your breastbone. Frowning (antagonist of zygomaticus) Orbicularis oris Indirectly from maxilla/mandible, fibers blend. a) Depressor anguli oris b) Mentalis c) Depressor labii inferioris d) Platysma e) Masseter, Which of the following muscles has superior, middle and inferior sections? Synergist: Gluteus maximus, Action: Medially rotates leg at thigh The longus colli is a deep cervical flexor acting as an important synergist with the sternocleidomastoid muscle. Synergist: serratus anterior, Action: Moves scapula towards chest wall The antagonist of the splenius capitis muscle is the Sternocleidomastoid. This muscle is innervated by the spinal accessory nerve (cranial nerve 11). Synergist: Action: stabilizes pelvis Synergist or Antagonist DRAFT. Middle Fibers: elevation, upward rotation and adduction of the scapula. B. Abdominal. After a signal reaches the accessory nerve nucleus in the anterior horn of the spinal cord, the signal is conveyed to motor endplates on the muscle fibers located at the clavicle. KenHub. Which muscle acts as an agonist with the teres minor during lateral rotation of the shoulder? a) Anterior Deltoid b) Teres Major c) Infraspinatus d) Latissimus Dorsi, Which of the following muscles acts to flex and adduct the arm? 1 What is the synergist muscle for sternocleidomastoid? Torticollis gives the appearance of a tilted head on the side involved. The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck. 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]. Cervical isometrics in various directions including flexion, side bending, and rotation. Antagonist: Latissimus dorsi Clavo-trapezius (posterior; superior to acromio-trapezius) . 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. They assist the SCM in turning and tilting both the head and neck. Developmentally, these additional muscle slips indicate abnormal mesodermal splitting in posterior sixth branchial arch. Synergist: pectineus, Action: Flexes knew The sternocleidomastoid muscles (SCM) help with functions such as head rotation, head tilt, pointing the chin toward the breastbone, and more. The absence of SCM cover may lead to complicated congenital neck hernias in children, in addition to functional limitations. 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? Bilaterally: cervical flexion, elevation of sternum and assists in forced inhalation. Lower: Levator Scapulae. This muscle binds the skull to the sternum and clavicle. Did Marta's family fly(5)\overset{\text{(5)}}{{\underline{\text{fly}}}}fly(5) in a time machine on the way back from Sydney? Antagonist: tensor fascia latae Synergist: Extensor hallucis longus, Action: Extends big toe 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. Pain was induced by injections of hypertonic saline . The following passage is from a journal kept by Meriwether Lewis and William Clark during their heralded exploration of the American West. Antagonist Muscles On the opposite side of the body from the multifidus and erector spinae are the abdominal muscles. skeletal muscle contracts and pulls on bone. a. Frontalis b. Occipitalis c. Masseter d. Sternocleidomastoid e. Rectus Abdominis f. Pectoralis Minor g. Pectoralis Major h. Supraspinatus i. Infraspinatus j. Subscapularis, All of the muscles that move the glenohumeral joint have a distal attachment on the humerus, except one. Synergist: teres minor, Action: Lifts ribs When you take a deep bow, which of the following muscles do you use? 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? We describe the main muscle that does an action as the agonist. The SCN can produce several different neck movements. antagonist: gluteal muscles, adductor muscles, tensor fascia latae, synergist: adductor muscles, gracilis They may not cause any functional advantage or disadvantage in neck movement but might be physically interfering during invasive procedures. The relationship between these muscles when bowing you head is C) The sternocleidomastoid is the prime mover and the splenius cervicis is the Our experts can answer your tough homework and study questions. Anne Asher, ACE-certified personal trainer, health coach, and orthopedic exercise specialist, is a back and neck pain expert. The positive effects of physical activity and exercise on almost all functions of the human body are widely acknowledged. Which of the following muscles is most active during flexion of the arm/glenohumeral joint? This little fleet altho' not quite so respectable as those of Columbus or Capt. Antagonist: rhomboids A. Sternocleidomastoid. What is the antagonist muscle in elbow flexion? Synergist: Quadriceps, Action: Plantar Flexion The neck muscles are responsible for stabilizing and moving the head in every direction and for pulling the jaw and skull towards the chest. Upload your PDF on PubHTML5 and create a flip PDF like Seeleys essentials of anatomy physiology ( etc. Which of the following muscle is most active during the abductive of the arm? Scalene Muscle Group Synergist: Sternocleidomastoid, Longus colli and capitis This would leave no posterior triangle. But opting out of some of these cookies may affect your browsing experience. You also have the option to opt-out of these cookies. Read the flipbook version of Seeleys essentials of anatomy physiology ( etc.). Antagonist: external intercostals Synergist: Gastrocnemius, Action: Flexes toes Antagonist: Flexor carpi radialis Occasionally, the lower portion of the SCM muscle is intercepted by tendinous intersections which indicate the origin of this muscle from different myotomes .The organizational pattern of the SCM can be arranged into five distinct topographical parts, namely the superficial sternomastoid, profound sternomastoid, sterno occipital, cleidomastoid and cleidooccipital parts which are arranged in superficial and deep layers. Sternocleidomastoid --- Splenius Capitis Preview this quiz on Quizizz. Antagonist: internal intercostals (a) diaphragm (b) triceps brachii (c) pronator teres (d) flexor carpi ulnaris (e) extensor indicis. Which of the muscles is involved in the pronation of the forearm? a. Pectoralis major b. Serratus anterior c. Supraspinatus d. Teres major. It also flexes the neck. Bilateral SCM muscle contraction thrusts the chin forward when your head is level.
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