Occasionally, the SCM fuses with the trapezius, leaving no posterior triangle. Antagonist: Masseter The sternocleidomastoid muscles (SCM) help with functions such as head rotation, head tilt, pointing the chin toward the breastbone, and more. Which one? Baltimore, Maryland: Williams & Wilkins. Synergist: Sarotious, Action: Abducts and medially rotates thigh Developmentally, these additional muscle slips indicate abnormal mesodermal splitting in posterior sixth branchial arch. To define the origin, insertion, and belly of a skeletal muscle. Muscles that Act on the Scapula . Which of these muscles is not the muscle of inspiration? 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. We also use third-party cookies that help us analyze and understand how you use this website. Platysma - single sheetlike; covers anterolateral neck; Sternocleidomastoid - paired muscle; PRAYER MUSCLE Is this considered flexion or extension? Synergist: teres major, Action: Lateral rotation of humerus 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: triceps brachii, synergist: external and internal obliques a) biceps femoris b) brachioradialis c) triceps brachii d) pectoralis major e) deltoid. 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 . It can be felt on each side of the neck when a person moves their head to the opposite side. Which muscle acts as an antagonist to trapezius? Variations Of The Sternocleidomastoid Muscle: A Literature Review. 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. For each verb form that is underlined, choose the letter of the best revision. a. Biceps brachii b. Triceps brachii c. Jaw d. Tongue. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. We also use third-party cookies that help us analyze and understand how you use this website. Torticollis gives the appearance of a tilted head on the side involved. Explore antagonistic muscles. A. appall Edit. The cookie is used to store the user consent for the cookies in the category "Other. supraclavicularis muscle When the clavicular origin is broad, it is occasionally subdivided into several slips, separated by narrow intervals. antagonist; erector spinae, synergist: hamsting muscles The muscle allows the head and vertebrae to extend. Antagonist: gluteus maximus Synergist: flexor digitorium superficialis, Action: Synergist to supinate arm The Anatomy of the Sternocleidomastoid Muscle. Synergist: Extensor hallucis longus, Action: Prime mover of toe extension Play this game to review undefined. 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. 10.2: Interactions of Skeletal Muscles, Their Fascicle Arrangement, and antagonist: adductor group, rectus femoris, synergist: gluteal minimus and tensor fasciae latae Antagonist: Flexor carpi radialis A contraction of both SCM muscles can flex your neck, which brings your chin down in the direction of your breastbone. Synergist: supraspinatus, Action: Pulls shoulders medially Treatment of a shortened SCN involves gentle stretching of a tight SCM muscle to lengthen it to a normal shape. Flexion of the head and cervical spine when anterior fibers act bilaterally, 3. The platysma muscle is a superficial muscle of the human neck that overlaps the sternocleidomastoid. Synergist: transverse abdominis, Action: compresses abdominal contents The sternocleidomastoid is innervated by accessory nerve of the same side. A neck extension movement that takes place at your first. When refering to evidence in academic writing, you should always try to reference the primary (original) source. 2 What muscle is behind the sternocleidomastoid? What is the relationship between these muscles when bowing your head? shotty's jello shots vegan; stephanie cartel crew before surgery; what does not retained mean on job application; new restaurants coming to jacksonville nc 2022 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. antagonist: adductor group, gracilis, synergist: gluteus medius, gluteus minimus, gluteus maximus If you believe that this Physiopedia article is the primary source for the information you are refering to, you can use the button below to access a related citation statement. Describe how the prime move Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. The supraclavicularis muscle arises from the manubrium behind the sternocleidomastoid and passes behind the sternocleidomastoid to the upper surface of the clavicle. Antagonist: external intercostals What is the synergist muscle for sternocleidomastoid? The party are in excellent health and sperits, zealously attached to the enterprise, and anxious to proceed; not a whisper or murmur or discontent to be heard among them, but all act in unison, and with the most perfict harmony. The SCM becomes chronically shortened in cases of torticollis. The passage is written by Lewis and dated April 7, 1805. It can also occur with certain health conditions, such as asthma and. Synergist: Pronator teres, Action: Extends and abducts wrist The SCM has two heads. [5][6] It supplies only motor fibres. Middle: Pectoralis minor, serratus anterior Analytical cookies are used to understand how visitors interact with the website. a) Zygomaticus major b) Digastric c) Sternohyoid d) Depressor anguli oris. They may not cause any functional advantage or disadvantage in neck movement but might be physically interfering during invasive procedures. When both SCM muscles contract, the movements can include: Simultaneous bilateral SCM muscle contraction also plays a role in the breathing process. An impairment or injury to the spinal accessory nerve can cause weakness or paralysis to the SCM. 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. Skeletal Muscles - University of Pittsburgh 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. The splenius captis is located on the lateral side of the C7. The t-tubule meets with the sarcoplasmic reticulum at locations throughout the muscle fiber, at these locations the sarcoplasmic reticulum releases calcium ions that results in the movement of troponin and tropomyosin on thin filaments. Sternocleidomastoid muscle 32 languages The sternocleidomastoid muscle is one of the largest and most superficial cervical muscles. Agonist and Antagonist Pairs and Origin and Insertion Terms On either side, the SCM diagonally divides the neck musculature into anterior (front) and posterior (back) triangles. It is partially covered by the gluteus maximus. StatPearls. 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) 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)? Synergist: rectus femoris, Muscles of the Forearm & Hand(Bio 107: Anatom, Head and Neck Muscles - Action, Antagonist, S, Muscles of the Forearm That Move Wrist, Hand, Byron Almen, Dorothy Payne, Stefan Kostka, Eric Hinderaker, James A. Henretta, Rebecca Edwards, Robert O. Self, By the People: A History of the United States, AP Edition. Anne Asher, ACE-certified personal trainer, health coach, and orthopedic exercise specialist, is a back and neck pain expert. Ch. 11 Key Terms - Anatomy and Physiology | OpenStax Antagonist: gluteus maximus This muscle is innervated by the spinal accessory nerve (cranial nerve 11). a. Pectoralis major b. Serratus anterior c. Supraspinatus d. Teres major. This tent is in the Indian stile formed of a number of (8) dressed Buffaloe skins sewed together with sinues. The sternocleidomastoid is innervated by the accessory nerve. This category only includes cookies that ensures basic functionalities and security features of the website. Antagonist: Gracilis L. languish Antagonist: Brachioradialis Lateral surface of the mastoid process through a strong tendon, and to the lateral half of superior nucheal line through an aponeurosis. The SCM inserts behind the ear at the mastoid process, a projection of the. a. supraspinatus b. rhomboids c. deltoid d. infraspinatous. Upper region of medial border and superior angle of scapula. The SCM runs diagonally from both the collarbone and the breastbone to the back of the ear. Such cases represent the developmental defect of muscular agenesis and are diagnosed by Ultrasound or Magnetic Resonance Imaging scans. Bilateral SCM muscle contraction thrusts the chin forward when your head is level. Synergist: Quadriceps, Action: Plantar Flexion Sternocleidomastoid Anatomy: Origin, Insertion, Action, Innervation Antagonist: Pronator teres In many animals, the cleidomastoid belly is distinctly separate from the sternomastoid belly. Sternocleidomastoid - Physiopedia The scalenes are synergist (helper) muscles to the SCM. Michael Menna, DO, is a board-certified, active attending emergency medicine physician at White Plains Hospital in White Plains, New York. 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: pectoralis major, Action: Extends and medially rotates humerus a) Splenius capitis b) Semispinalis capitis c) Sternocleidomastoid d) Trapezius, What are attachments for these muscles, and their functions? - a synergist - an antagonist - a fixator - a prime mover - an antagonist. This condition when present in humans is considered to be a variation from normal. Which of the following muscles is primarily a postural muscle? a) Clavicle b) Cervical vertebrae c) Scapula d) Sacrum. The sternocleidomastoid muscle originates from two locations: the manubrium of the sternum and the clavicle. In the Middle Ages, when the Catholic Church was all-powerful, a(n) 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. Action: Rotates scapula so that its inferior angle moves laterally and upward; important in horizontal movements of arm (pushing and . The sternocleidomastoid muscles flex the neck and the splenius cervicis muscles extend it. 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. Synergist muscles help other muscles perform one or more functions. ). [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. Just check all flip PDFs from the author ibed_guidance. The sternocleidomastoid muscle (SCM) is an important landmark in the neck which divides it into an anterior and a posterior triangle. a) orbicularis oris b) platysma c) orbicularis oculi d) sternocleidomastoid, What muscle is directly lateral to the sternohyoid? The sternocleidomastoid is the prime mover and the splenius cervicis is the antagonist. This can cause atrophy (shrinking) in the affected SCM and may cause difficulty in turning the head and bending the neck. a) Sternocleidomastoid b) Gastrocnemius c) Gluteus maximus d) Flexor carpi radialis e) None of the above; 1. Which of the following groups of muscles does not move the vertebral column? Read the entire passage once to get a general idea of what it is about. (Sternocleidomastoid synergist) Muscle Origin Insertion Action Muscle that Move the Pectoral Girdle Trapezius Occipital bone, ligamentum nuchae, spinous process C 7 - T 12. e) buccinator. D. The sternocleidomastoid is the fixator and the splenius cervicis is the prime mover. antagonist: quadriceps femoris muscles, synergist: adductor muscles 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? (adsbygoogle = window.adsbygoogle || []).push({}); For Pain and Symptom Information See: Sternocleidomastoid Muscles: Head, Eyes, Sinus, Ears, Throat Pain. Clark myself the two Interpretters and the woman [Sacajewea] and the child sleep in a tent of dressed skins. Synergist: palmaris longus, Action: Tenses skin & fascia of palm Muscle Anatomy Chart - Muscle Origin Insertion Action Muscle - StuDocu The sternocleidomastoid muscle is one of the largest and most superficial cervical muscles. Synergist: Tensor fascia latae, Action: Extends thigh 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 _____. skeletal muscle contracts and pulls on bone. Save. Synergist: Supinator, Action: Extends and flares fingers A synergist that makes the insertion site more stable is called a fixator. as a prime mover contracts the according to the size and function of the mus- antagonist progressively relaxes, . Antagonist: deltoid 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 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 (. 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. Antagonist: rhomboids a) Long head of biceps brachii b) Pectoralis minor c) Coracobrachialis d) Short head of biceps brachii. Top Contributors - Venus Pagare, Admin, Kim Jackson, Joao Costa, Daniele Barilla, WikiSysop, Joshua Samuel, Evan Thomas, Tarina van der Stockt and Lucinda hampton, Sternocleidomastoid (SCM) (synonym musculus sternocleidomastoideus)is a paired superficial muscle in the anterior portion of the neck. Prime mover, Synergist, Antagonistic muscles.wmv Vitamin D and diabetes Dr. John Campbell 3 days ago New Muscle Spindle & Stretch Reflex || Knee Jerk Reflex Elbow joint. An aponeurosis is a broad flat expanse of tendon. Muscles that work like this are called antagonistic pairs. Middle Fibers: elevation, upward rotation and adduction of the scapula. What experience do you need to become a teacher? A. Vastus medialis B. Adductor magnus C. Rectus femoris D. Iliacus E. Sartorius. a) deltoid. Extension of the head and cervical spine when posterior fibers act bilaterally, 2. 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 synergist: sternocleidomastoid, rhomboids supraspinatus synergists: middle deltoid and infraspinatus antagonist: pectoralis major, latissimus dorsi, teres major Antagonist: Biceps brachii antagonist: gluteal muscles, adductor muscles, tensor fascia latae, synergist: adductor muscles, gracilis The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck. It IS NOT medical advice. Churchill Livingstone. The sternocleidomastoid muscles help to flex the neck. Treatment involves physiotherapy exercises to stretch the involved muscle and strengthen the muscle on the opposite side of the neck. Our vessels consisted of six small canoes, and two large (1) pirogues. a. Pectoralis minor b. Subscapularis c. Rhomboid d. Trapezius, Which of the following muscles has two heads? Gives you the force to push the ball. 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. Antagonist: triceps brachii Which of the following muscles flexes the neck? The sternocleidomastoid muscle has a cylindrical, strap-like shape that emerges from the side of your neck and tapers at the ends. The cookie is used to store the user consent for the cookies in the category "Analytics". E. The sternocleidomastoid is the synergist and the splenius cervicis is the fixator. 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? Torticollis. antagonist: trapezius, latissimus dorsi, rhomboids, pectoralis major, antagonist: biceps brachii and brachialis, synergist: brachialis an antagonist to the sternocleidomastoid muscle would be Antagonist: infraspinatus They act to extend the spine, bending it backwards. As the muscles contract across the shoulder joint it brings your shoulder upward into flexion as you push the ball the opposite happens and the antagonist becomes your deltoid and the latissimus dorsi becomes your agonist. Antagonist: gastrocnemius Strap-like; e.g., sternocleidomastoid Or: Antagonist: Triceps Platysma muscle - Wikipedia The sternocleidomastoid is innervated by the accessory nerve . 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? _____ was likely to be burnt at the stake. Antagonist: Sartorious M. lavish The function of this muscle is to rotate the head to the opposite side or obliquely rotate the head. [2] It protects the vertical neurovascular bundle of neck, branches of cervical plexus, deep cervical lymph nodes and soft tissues of neck from damage [2 . PDF Muscular Considerations for Movement Some images used in this set are licensed under the Creative Commons through Flickr.com.Click to see the original works with their full license. The Sternocleidomastoid is an anterior muscle of the neck. Sternocleidomastoid. 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. This cookie is set by GDPR Cookie Consent plugin. Antagonist: sartorious (b) Ansa cervicalis. Synergist: NA, Action: Planatar flexion when knee is extended What Are Muscle Agonists, Antagonists, And Synergists? - 3D Muscle Lab Synergist: infraspinatus, Action: stabilizes scapula D. The sternocleidomastoid is the fixator and the splenius cervicis is the prime mover. Sternocleidomastoid (SCM) muscle pain in the neck typically results from muscle tension or performing repeated motions. One originates from the collarbone/clavicle and the other from the breastbone/manubrium. In this case, it lifts up the breastbone and the area of the collarbones that are nearest to the midline of the body. a. Levator scapulae b. Pectoralis minor c. Rhomboid d. Serratus anterior e. Trapezius, Which of the following muscles is the prime flexor of the arm at the shoulder joint? The sternocleidomastoid muscle flexes the neck and helps with movement of the head. Agonist is deltoid, antagonist is the latissimus dorsi. The splenius captis is located on the lateral side of the C7. Sternocleidomastoid. Which muscle acts as a synergist with pectorals minor during abduction of the scapula? The sternocleidomastoid muscles flex the neck and the splenius cervicis muscles extend it. 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? a) sternocleidomastoid b) orbicularis oculi c) trapezius d) platysma, Which muscle acts to anchor the scapula? B. Which muscle acts as an agonist with the teres minor during lateral rotation of the shoulder? Role of muscles . Which of the following muscles is most active during extension of the arm/glenohumeral joint? What muscle attaches at the anterior superior iliac spine, and crosses both the hip and knee joints? Anatomy of the Human Body. 5- 10 reps/ 1-2 seconds Dynamic Stretching . Synergist: abductor pollicis longus, Action: Flexed thumb What is the relationship between these muscles when bowing your head? Synergist: deltoid, Action: lateral rotation of humerus 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. The superficial layer includes sternohyoid and omohyoid, while the deep layer is made up of sternothyroid and thyrohyoid. Antagonist: Tibialis Anterior Antagonist: tensor fascia latae The following passage is from a journal kept by Meriwether Lewis and William Clark during their heralded exploration of the American West. That is usually the journal article where the information was first stated. The muscle fibers of all these layers lie within a common fascial sheath and traverse in the same direction.Knowledge of this layered arrangement and the changes in cases of muscle variations is helpful during muscle flap harvesting procedures. By clicking Accept All, you consent to the use of ALL the cookies. Some larger muscles are labeled. Definition The gluteus medius is one of four superficial gluteal muscles that allow a broad range of movement in the hip joint. Synergist: Platysma, Action: Flexes neck forward when together . Which of the following muscles is most active during flexion of the arm/glenohumeral joint? Thank you, {{form.email}}, for signing up. Suppose a person travels around the world and lays(8)\overset{\text{(8)}}{{\underline{\text{lays}}}}lays(8) a watch each time he or she enters a new time zone. process of using agonist and synergist to dynamically move the joint into range of motion. H. erroneous The fibers from the accessory nerve nucleus travel upward to enter the cranium via the foramen magnum. synergist and antagonist muscles - raahdari.com (a) Brachialis (b) Subscapularis (c) Teres minor (d) Supraspinous. In the blank, insert the most appropriate word. Which of the following does not attach to the corocoid process of the scapula? a) triceps brachii b) brachialis c) brachioradialis d) coracobrachialis e) anconeus, When the biceps brachii flexes, what is the antagonist? Antagonist Muscles On the opposite side of the body from the multifidus and erector spinae are the abdominal muscles. Clavo-trapezius (posterior; superior to acromio-trapezius) . (a) Deltoid (b) Flexor digitorum superficialis (c) Biceps brachii (d) Teres major. Antagonist: Tensor fascia latae Antagonist: NA antagonist: tensor fasciae latae and gluteal muscles, synergist: hamstring muscles, gracilis, gastrocnemius, and sartorius 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. For example, the scalenes are synergist muscles to the sternocleidomastoids (SCM), because they help with turning and tilting the head and neck. Synergist: trapezius, Action: extends or hyperextends head antagonist: tensor fasciae latae, gluteal minimus, and medius muscles, synergist: adductor muscles and gracilis d. Splenius. Furthermore, they are components of the boundaries of the submental and submandibular triangles of the neck. 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. Which of the following muscles performs cervical extension only? ), In American English, words ending in the sound ens are usually spelled with -nce, as in reverence. Along the muscle fibers are t-tubule openings which facilitate the spread of the action potential into the muscle fibers. O pectoralis major O latissimus dorsi O deltoid O biceps brachii, Protrusion-Retrusion involves the movements of which muscle? a. splenius cervicis b. latissimus dorsi c. trapezius (upper fibers) d. serratus anterior e. teres major. Lateral flexion of the head and cervical spine when acting unilaterally A. Frontalis B. Lateral rectus C. Sternocleidomastoid D. Masseter E. Hyoglossus, Which of the muscles listed below initiates movement at the talocrural (ankle) joint? b) masseter. Synergist: vastus lateralis, Action: extends knee Antagonist: Sartorious (a) Deltoid (b) Teres major (c) Infraspinatus (d) Coracobrachialis (e) Trapezius. When you visit the site, Dotdash Meredith and its partners may store or retrieve information on your browser, mostly in the form of cookies. Necessary cookies are absolutely essential for the website to function properly. Scalene Muscle Group Synergist: Sternocleidomastoid, Longus colli and capitis Sternocleidomastoid Muscle: Anatomy and Function - Verywell Health Etymology and location [ edit] The ACH causes the resting potential to increase above -55mV, thus initiating an action potential which travels along the muscle fiber.
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sternocleidomastoid synergist and antagonist