An equilibrium mixture of CO2,CO\mathrm{CO}_2, \mathrm{CO}CO2,CO, and O2\mathrm{O}_2O2 exits at 3000K,1.5bar3000 \mathrm{~K}, 1.5\ \text{bar}3000K,1.5bar. C. peroneus brevis Learn everything about those triangles with the following study unit. Rectus Abdominus, External oblique, Internal oblique. The brachial plexus should lie between these two muscles. Muscle that stabilizes the origin of another muscle, Muscle that opposes and reverses the action of another muscle, Muscle that is primarily responsible for bringing about a particular movement, Muscle that aids another by promoting the same movement. a) temporalis. c. Which two muscles in that group are synergists? An antagonist muscle relaxes (or stretches) when the prime mover muscle contracts. E. brachioradialis. C. facial expression. C. allows one to sit cross-legged. B. What is the antagonist of the Iliocostalis (Spine extension)? B. diaphragm. The number of muscle fibers best determines how powerful a muscle will be, Which of the following joint muscles is correctly matched with its lever type? Antagonistic muscle that is paired with an agonist muscle is referred together as antagonistic pairs. A. sternocleidomastoid A. deltoid A they have opposite functions B they push bones in opposite directions Assume that the only force acting on him during the collision is that due to the ground. Identify the vertebral parts/areas described below: Provides lever against which muscles pull. . D. tensor fasciae latae What is the antagonist of the Serratus Anterior (Protract scapula)? A. quadriceps femoris E. vastus intermedius, Of the following muscles of the leg, which one is on the anterior side of the leg? A. levator scapulae E. internal intercostals. . E. flexor carpi radialis. With respect to skeletal muscles, proprioceptors are important for: a muscle working in opposition to another muscle. In the following exercise, the first sentence describes someone or something. scalene muscles It has no effect. What is the antagonist of the Flexor Digitorum Profundus (finger flexion)? B myoglobin and myosin The sternocleidomastoid muscles help to flex the neck. - biceps brachii at the elbow; third-class lever D. multifidus D. is used in the knee-jerk reflex. B. transversus abdominis. The deep muscles of the neck, levator scapulae and middle scalene muscle are supplied by which nerve? The sternocleidomastoid is innervated by the accessory nerve . D. transversus abdominis What does the term levator mean? C. brachialis - trapezius action on the atlanto-occipital joint; second-class lever B. straight. C. linea alba . Anatomy. From what height did the student fall? Which muscle is the prime mover of arm abduction (assuming all fibers are used)? i think it's the rectus capi lateralus. To explain skeletal muscle movements as activities of agonists (prime movers), antagonists, and synergists. (i) Is the wavelength of the ground-state wave function The radial pulse can be felt just lateral to the tendon of the A. sartorius Antagonistic pairs or pairs of muscles that work opposite one another can also contract at the same time and potentially cause injuries. If so, where does it form an image? What is the antagonist of the Upper Portion Trapezius (Elevate scapula)? D. flex the forearm. D. triceps brachii (ii) Is the magnitude of the ground-state momentum D. transversus abdominis B ATP/carbon dioxide A. genioglossus B hemoglobin in muscles Which muscle pulls the skin of the chin upward? The external intercostal muscles are used primarily in __________. Major Skeletal Muscle Synergists-Biol 241 Sap, The Language of Composition: Reading, Writing, Rhetoric, Lawrence Scanlon, Renee H. Shea, Robin Dissin Aufses, Byron Almen, Dorothy Payne, Stefan Kostka, Lecture 27: The Federal Executive & Bureaucra. A. tibialis anterior A. Sternocleidomastoid. Muscles that elevate the jaw and close the mouth include the a) Temporalis b) Rectus abdominis c) Erector spinae d) Sternocleidomastoid e) Splenius capitis. it closes, purses, and protrudes the lips. C gluteus maximus An antagonist muscle is in opposition to a prime mover in that it provides some resistance and/or reverses a given movement. A. quadriceps femoris The sternocleidomastoid is the prime mover and the splenius cervicis is the antagonist. movement of the masseter and the temporalis. D depolarization is stimulated by cholinesterase, In the sliding filament mechanism of muscle contraction, the proteins that inhibit contractions are: E. palm. Test your knowledge about the sternocleidomastoid and other anterior muscles of the neck with the following quiz: During pathological changes of the sternocleidomastoid the clinical picture of the wryneck occurs (bending of the head to the affected muscle and rotation to the healthy side). inversion Approximately 0.5% of all newborns suffer from muscular torticollis, however, the etiology remains unclear. E. lifting weight with your arm. LAB 5 Muscle I Axial Muscular System Objectives: To know the primary functions of the muscular system. Match the following fascicle arrangement with the appropriate power generation or description: Parallel, Straplike with an expanded belly; great ability to shorten but not usually very powerful. E. multipennate. C. extensor digitorum longus What is a muscle that is an antagonist to the biceps femoris muscle? Which of the following statements is correct? B. childbirth. B. gastrocnemius transverse; parallel to the long axis. A. pectoralis major E. gracilis, Which muscle abducts and flexes the thigh? pectoralis major Some of the antagonistic pairs are as follows: Biceps and triceps Gluteus maximum and hip flexors Hamstrings and quadriceps Pectoralis major and latissimus dorsi B less permeable to potassium ions What back muscle originates on the vertebral spinous processes? hope you all enjoy the vid!enjoy the video and reflect on the mod. E. rotate the forearm, . Synergists help agonists. The pelvic diaphragm is formed by the C. flexor carpi radialis E. lever is a pivot point. 2012-03-06 . We experience muscle knot, spasm, or pain located over the muscle between the neck and the shoulder. C. orbicularis oculi D. sphincter urethrae and sphincter ani muscles. Which of the following muscles is responsible for closing the eyelids? E. fixator. D. flexor digitorum profundus What is the antagonist of the Scalenes (Neck extension)? Biceps Femoris, Semitendinosus, Semimembranosus. eversion Identify the muscle that performs the following function: Two muscle pairs that flex the vertebral column; compress the abdomen, and laterally flex the vertebral column. A. infraspinatus List the muscles of the Thenar eminence and their function. C. extensor pollicis longus. Previously, a single source of progenitor cells was thought to be responsible for the formation of the cardiac muscle. Anatomy of the Respiratory System The function of the respiratory system is to obtain oxygen from the atmospheric air Oxygenating all cells of the body Obtains oxygen from atmospheric air, alveoli is where gas exchange occurs Oxygen diffuses from the blood Ventilation:taking oxygen in and exhaling co2 (breathing) inspiration : transport of oxygen through alveoli . D trapezius, The muscle on the posterior side of the trunk that extends and adducts the arm is the: C. pectoralis minor Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. E. vastus lateralis, . 2023 The antagonist to the sternocleidomastoid is the splenius capitis. Explain your reasoning using an example. Identify the muscle that performs the following function: Paired muscle that extends vertebral column, maintains erect posture, and laterally flexes the vertebral column. - muscles that oppose or reverse a particular movement. A) The sternocleidomastoid is the prime mover, and the splenius cervicis is the fixator. Explain the role of both muscles in terms of agonist and antagonist in both of these movements. Which of the following muscles flexes the wrist? Splenius Capitus. Of the following muscles of the thigh, which one is on the posterior side? [1] In the anterior triangle, we find the suprahyoid and infrahyoid muscles. B. origin and insertion. To define the origin, insertion, and belly of a skeletal muscle. What thoracic muscles are involved in expiration? Name the following: A contraction in which muscles produce tension but do not shorten. E. down. Muscles that change the shape of the tongue are called a. Frontalis b. Occipitalis c. Masseter d. Sternocleidomastoid e. Rectus Abdominis f. Pectoralis Minor g. Pectoralis Major h. Supraspinatus i. Infraspinatus j. Subscapularis. convergent D. extensor digitorum longus B. serratus anterior Muscles that have their fasciculi arranged like barbs of a feather along a common tendon are called. What is the antagonist of the Extensor Digitorum (finger extension)? B negative/neutral What are the functions of the sternocleidomastoid muscle? Prime movers and antagonists are often paired up on opposite sides of a joint, with their prime mover/antagonist roles reversing as the movement changes direction. Which muscle is known as the "boxer's muscle" for its ability to move the arm horizontally, as in throwing a punch? The primary function of the deep muscles of the thorax, such as the intercostals, is to promote __________. Name five muscles that extend the vertebral column. The zygomaticus major muscle B. flexor carpi radialis - Multipennate muscles do not produce much power because the fibers run in many directions. Sternocleidomastoid muscle: want to learn more about it? E. All of these choices are correct. E. fibularis brevis, Which muscle everts and plantar flexes the foot? D. biceps femoris Antagonists counter the action of a prime mover. a group of muscles that work together to cause movement. D. trapezius C. contributes to laughing and smiling. Which of the following muscles would be considered an antagonist to the rectus femoris? E. coracobrachialis, The teres major and teres minor are not involved in D. internal abdominal oblique. When both sternocleidomastoid muscles contract, the head is flexed. (Hint: Integrate over disk-shaped mass elements of thickness dyd ydy, as shown in the given figure.). TLR9 is an important receptor expressed in immune system cells including dendritic cells, macrophages, natural killer cells, and other antigen presenting cells. A. injuries resulting from excessive stress on the tibialis posterior. D muscle fibers must have oxygen to complete cell respiration, The term "oxygen debt" means Which of these muscles is located on the ventral (anterior) side of the body? D. flexion of the elbow to elevate the hand If the head is fixed, it elevates the sternum and clavicle and, thus, expands the thoracic cavity (inspiratory breathing muscle). insert and sometimes originate on skin and connective tissue. movement of the sternocleidomastoid and the trapezius. D. Pectoralis minor. Getting their priceless heirlooms back was not enough for the many victims of the thief; they wanted the thief to serve time in prison. Tilt your head towards the left. E. deltoid, . What is the antagonist of the Glutues Maximus (extension of femur)? 3 synonyms for musculus sternocleidomastoideus: sternocleido mastoideus, sternocleidomastoid, sternocleidomastoid muscle. D iliopsoas, The muscle on the anterior thigh that flexes the thigh is the: E. C. biceps femoris C brachioradialis and biceps brachii A. a dimple in the chin. What is the antagonist of the Semimembranosus (knee flexion)? auricular m's 1. the extrinsic auricular muscles, including the anterior, posterior, and superior auricular muscles. We could also say that the antagonist is the main muscle that does the opposite of the action that it is resisting. What is the antagonist of the Peroneus Brevis (eversion)? C. inability of a male to have an erection. 1 and 3 A. represent a combination of first-class and second-class lever systems. a. Digastric b. Mylohyoid c. Omohyoid d. Sternocleidomastoid. D. intrinsic muscles. a muscle working in opposition to another muscle The information we provide is grounded on academic literature and peer-reviewed research. A. pectoralis major. B. gastrocnemius. B cholinesterase to return the impulse to the neuron B cerebellum Most flexor muscles are located on the ___ aspect of the body, most extensions are located ___. Describe how the prime move The sternocleidomastoid muscle is named according to its bony attachments (sternum, clavicle, and mastoid process).. 2. E. attach at the distal end of the humerus, A tennis player complains of severe pain in the shoulder when serving or returning an overhead volley. Semispinalis Capitis, etc. B. extend the forearm. People with this disorder show difficulties swallowing, extreme immobility of their throat, facial asymmetries and scoliosis. What is the antagonist of the Pectoralis Major (Flexion of humerus)? Which muscle lies directly posterior to the musculus serratus posterior inferior right and left muscle groups? What is the antagonist of the Sternocleidomastoid (Neck flexion)? A. straight. D adductor group, The muscle on the posterior thigh that extends the thigh is the: A muscle that assists the prime mover muscle. C. occipitofrontalis A. scalenes. D. causes crow's feet wrinkles. B. peroneus longus The sternocleidomastoid Match the action with its appropriate arm muscle name: Flexes forearm at elbow joint and supinates forearm biceps brachii The external intercostal muscles are used primarily in __________. Flexor Carpi Ulnaris, Flexor Carpi Radialis. A muscle that extends both the wrist and the index finger is the A. tibialis anterior D. vastus medialis A. difficult urination. D. retinaculum. E. splenius capitis, Of the following muscles of the head, which one wraps around the orbits? bulbospongiosus a) biceps brachii. What is the antagonist of the Soleus (Plantarflexion)? In an antagonistic muscle pair, as one muscle contracts, the other muscle relaxes or lengthens. A. back muscles are strong to maintain erect posture. What muscle is directly lateral to the sternohyoid? . In humans A. pennate. Which of the following muscles is named for its action? Agonists are the prime movers for an action. The muscle shape that has the capacity to shorten to the greatest degree is E. linea alba. (c) Transverse cervical. (b) Ansa cervicalis. rectus; straight A. retinacula. E. coccygeus only. Does tightness and tension in your neck keep you from getting to sleep at night? What is the antagonist of the Latissimus Dorsi (Extension of humerus)? Which of the following muscles has superior, middle and inferior sections? D. gracilis What is the antagonist of the Sartorius (Flexion of femur)? c) pectoralis major. E. fibularis brevis, Which muscle extends the big toe? A. palmaris longus The __________ nerve innervates all of the extrinsic tongue muscles. What muscle(s) serves as an antagonist to the biceps? C more heat is produced as cell respiration decreases E. piriformis. __________ muscles have their fibers arranged obliquely to their tendons In a manner similar to a feather, such as unipennate, bipennate, and multipennate muscles. D gastrocnemius, David N. Shier, Jackie L. Butler, Ricki Lewis, Hole's Essentials of Human Anatomy and Physiology, David Shier, Jackie Butler, John Hole, Ricki Lewis, Charles Welsh, Cynthia Prentice-Craver, David Shier, Jackie Butler, Ricki Lewis, 3.1 - Definitions (Monitoring, Process Contro, Unit 2 - Cell Structure and Function AP BIO. Your hamstrings or the back of your thigh, and quadriceps which are located on the front of your thigh are an antagonistic pair. bipennate B flex the vertebral column 2 and 4 Which of the following muscles is unique, in that it acts as its own antagonist? Under the sternocleidomastoid region runs a neurovascular bundle containing: When putting a central venous catheter (CVC), the medial edge of the sternocleidomastoid muscle serves as a lead structure. C teres major B. orbicularis oris C heat C. opponens pollicis. Which abdominal wall muscle inserts on the xiphoid process and the linea alba? D. dorsal interossei. Clostridium botulinum Clostridium botulinum type A Clostridium botulinum type E Clostridium botulinum type B Clostridium botulinum type F Clostridium botulinum type D. Do you experience neck pain at work? D. chubby cheeks. B. adduction of the arm. E. back muscles are similar in strength to the back muscles of cattle. joint act as a fulcrum. d) buccinator. B. deep transverse perineum muscle. C. interspinales D. multifidus The arm is attached to the thorax by the E. peroneus longus. D. suprahyoid C. triceps brachii Copyright (a) greater for well 1, What is this muscle called? Upper Portion Trapezius, Levator scapulae. E. gastrocnemius, Which of the following is a posterior thigh muscle? When you say "ah" and stick out your tongue, which muscle do you use? What is the antagonist of the Triceps Brachii (extension of forearm)? C. orbicularis oculi holds it in place) so that the prime mover can act more efficiently. In an antagonistic muscle pair as one muscle contracts the other muscle relaxes or lengthens. extension The. A. After administering ketamine/xylazine mixture (50 and 5 mg/kg, respectively) in order to induce surgical anaesthesia, appropriate shaving of the right cervical area was performed. Match the following muscle action involving facial expression with its appropriate muscle: Sphincter muscle of the eyelids, which permits squinting and blinking. D. transversus abdominis b) orbicularis oris. Tilt your head to the right as far as you comfortably can. The brachial plexus should lie between these two muscles. What is the antagonist of the Vastus Lateralis (knee extension)? The sternocleidomastoid muscle (SCM) is an important landmark in the neck which divides it into an anterior and a posterior triangle. Sphincters have a __________ arrangement of fascicles. Which functional group has the major responsibility for countering a specific movement? Match the following fascicle arrangement with its appropriate power generation or description: circular. A. anconeus In rats, the sternocleidomastoid is composed of two bellies, a superficial sternomastoid medially and a deeper cleidomastoid laterally [ 3 ]. Createyouraccount. A flex the neck E. supinators. B. contributes to pouting. What is the antagonist of the Brachialis (Flexion of forearm)? C. interspinales The deltoid is a muscle named according to __________. C. triceps brachii and supinator. B. gluteus medius. A raise the shoulder parallel, List the arrangement of components found in a third-class lever. C. abductor pollicis longus E. flexes the shoulder. Identify two muscles that are antagonists of tibialis posterior. D. extensor hallicus longus A. puckers the mouth for kissing. Select all that apply. a) Depressor anguli oris b) Mentalis c) Depressor labii inferioris d) Platysma e) Masseter. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. D. vocalis What is the antagonist of the Vastus Medialis (knee extension)? . coccygeus Flexor Digitorum Superficialis, Flexor Digitorum Profundus. What is the antagonist of the Rectus Abdominus (Trunk flexion)? Most of us carry a lot of tension in the upper trapezius and neck muscles. external intercostals D. extensor hallicus longus What is the antagonist of the Gluteus Medius (abduction of femur)? A quadriceps femoris What are the muscles in the neck and the chest area? E. nonlever system. C. contributes to laughing and smiling. Want to learn the origins andinsertions (plusinnervations and functions!) C. a wonderful smile. Which statement is NOT true of organ systems and movement? C. vastus lateralis. The more stationary attachment of a muscle to a bone is called the: Which statement is NOT true of gross muscle structure? A. puckers the mouth for kissing. A. biceps femoris Go to: Clinical Significance Change in the platysma with age: Reviewer: A. interossei palmaris D. tensor fasciae latae Muscles that work like this are called antagonistic pairs. A rectus abdominus D. type and shape. B. belly. E. rhomboideus major, Which of the following muscles of the chest has its insertion on the humerus? D. unipennate D. tensor fasciae latae E. psoas minor, Which back muscle inserts on the ribs and vertebrae? The major abductor muscle of the upper arm is the __________. E. transverses thoracis. Write down equations to describe the alpha decay of the following atoms: Stabilizes the wrist during finger extension. C. medially rotates the arm. Aim to feel a stretch on the right Sternocleidomastoid. D orbicularis oculi- closes eye, Which muscle is NOT paired with its correct function? D. causes crow's feet wrinkles. A sodium ions C repolarization creates a reversal of charges What is the antagonist of the Rhomboids (Retract scapula)? 10. 5. Place your left hand on the right side of your head. What is the antagonist of the Pectoralis Minor (Protract scapula)? E. masseter. D. abducts the arm. C. tibialis anterior D masseter- raises mandible, Which muscle is NOT paired with a synergist? B. teres major Supination of the forearm and hand is accomplished by the 75 Free NCLEX Questions - c/o BrilliantNurse., David N. Shier, Jackie L. Butler, Ricki Lewis, Charles Welsh, Cynthia Prentice-Craver, David Shier, Jackie Butler, Ricki Lewis, Intro to Sociology Final Exam Study Guide. C. extensor digitorum longus E. rhomboideus major, Which muscle rotates and protracts the scapula, and elevates the ribs? At the same time, itflexes the lower cervical column causing an overall bending of the neck towards the chest. What is the antagonist of the Flexor Carpi Radialis (wrist flexion)? D. causes crow's feet wrinkles. Which statement is NOT true of muscle sense? C. teres major E. calcaneal; peroneal, Which of the following muscles is used when walking on your tiptoes? B tetanus sternocleidomastoid Question: The sternocleidomastoid muscles flex the neck, and the splenius cervicis muscles extend it. A. function and orientation. A gastrocnemius and soleus (a) sternocleidomastoid (b) splenius capitis (c) semispinalis cervicis (d) scalenus anterior. What is the antagonist of the Quadratus Lumborum (Lateral trunk flexion)? B sacromere a) Clavicle b) Cervical vertebrae c) Scapula d) Sacrum. D. tensor fasciae latae A. C. rectus femoris. a) orbicularis oris b) platysma c) orbicularis oculi d) sternocleidomastoid. D water, During muscle contraction, oxygen is stored in muscles by: The pair consists of muscles wherein one contracts while the other relaxes. See appendix 3-4. a) Deltoid b) Pec Major c) Bicep Brachii d) Supraspinatus. In order to stabilize the hyoid so that the larynx can be elevated in swallowing, the _____ muscle group is used. B tetanus/coordination E. coracobrachialis. A. fix the scapula in place. D. defecation. B. straight. What is the antagonist of the Lower Portion Trapezius (Depress scapula)? What is the antagonist of the Flexor Carpi Ulnaris (wrist flexion)? The primary actions of the muscle are rotation of the head to the opposite side and flexion of the neck. D triceps brachii, The muscle around the eye that closes the eye is the: A. trapezius A. extend the neck. E. pennate, The adductor longus is named for its D. zygomaticus major C. vastus lateralis A. gastrocnemius B. triceps brachii A. flexor carpi ulnaris. D sarcolemma, At the neuromuscular junction, the sacrolemma contains: D. coracobrachialis A. rectus abdominis C extend the vertebral column What are synonyms for sternocleidomastoid (muscle)? A. c) sternocleidomastoid. Rectus Abdominus, external oblique, internal oblique The prime mover of arm flexion is the __________. Give the scientific term for the muscles of the mouth, b. The sternocleidomastoid muscle is an axial muscle located on either side of the neck and supports forward and lateral flexion at the neck as well as rotation and elevation of the sternum and clavicle. What is the antagonist of the Extensor Carpi Ulnaris (wrist extension)? The type of muscle that can contract with the greatest force is the A sartorius A sarcolemma C. adductor magnus Which of these muscles is the muscle of expiration? What is the antagonist of the Flexor Digitorum Longus (Toe 2-5 flexion)? B. C. internal abdominal oblique . D adductor group, The mucle on the lateral side of the hip that abducts the thigh is the: An agonist (prime mover) b. caustic, prodigal, exodus, irreverent, tenuous, retribution, taciturn, raconteur. (4) left medial rectus C. fibularis longus Antagonists: Longissimus Capitis Spinalis Capitis Splenius Capitis Semispinalis Capitis Sternocleidomastoid (posterior fibers) 3. B. Abdominal. E. psoas major. What is the antagonist of the Supraspinatus (Abducts humerus)? the muscle that does most of the movement. B hamstring group D. causes crow's feet wrinkles. Which of the following muscles is involved in forced expiration? Draw two lines under the verb in parentheses that agrees with the subject. What is the antagonist of the Middle Portion Trapezius (Retract scapula)? If a man exercises by doing push-ups every day, he would strengthen or enlarge which of the following muscles? E. supinator and brachialis. E. raises the eyelid. (a) diaphragm (b) external intercostals (c) sternocleidomastoid (d) scalenes (e) abdominal muscles. D. rotate the head toward the left. Fixators hold joints in place, so movement does not occur. What is the antagonist of the Levator Scapulae (Elevate scapula)? D anterior mandibularis, The muscle on the ventral side of the abdomen that flexes the vertebral column is the: C extend the forearm When the internal intercostals and the abdominals engage to bring the ribcage back into its starting position, try to keep the ribcage and lungs as expanded as possible even as you exhale the breath. B. gastrocnemius; soleus B hamstring group A. rectus abdominis B. transversus abdominis C. erector spinae D. latissimus dorsi. C toponin and tropomyosin B quadriceps femoris What is the antagonist muscle to the sternocleidomastoid? appendicular muscle one of the muscles of a limb. Biceps Brachii, Brachialis, Brachioradialis. Which of these muscles is not the muscle of inspiration? Which one of those muscles is considered the prime mover? B. external abdominal oblique B. force or pull is applied by the bone. movement of semimembranosus and semitendinosus. C. most of the muscle mass in the lower back is from the spinalis muscle. E. fibularis brevis, . Respiratory Problems. anterior scalene, Eversion and plantar flexion is accomplished by muscles in the ______ compartment. C. masseter muscles. transversus thoracis, levator scapulae, pectoralis minor, rhomboideus muscles, serratus anterior, trapezius, choose all that apply: C. vastus lateralis The muscles of the anterior group of forearm muscles are primarily A. pterygoid Match the muscle with its correct origin and insertion: Temporalis, Origin: temporal fossa D. masseter Identify metals and alloys that have strengths comparable to those of reinforced plastics. The sternocleidomastoid muscle is innervated by the accessory nerve (cranial nerve XI) and direct branches of the cervical plexus (C2-C3). C less permeable to sodium ions Which has an insertion on the mandible? Antonyms for sternocleidomastoid (muscle). B. class II lever system. The SCMs on each side of your body course from the breastbone and collar bone in the upper part of the chest to the back of the head. When muscles are named for the movement they produce, one can find action words in their name. B extend the leg Get access to this video and our entire Q&A library, Function & Anatomy of the Muscles of the Face, Neck & Back. When both sternocleidomastoid muscles contract, the head is flexed. Damage to which of the following muscles would hinder inspiration? B. sartorius What is the antagonist of the Extensor Hallucis Longus (Toe 1 extension)? A. does most of the work in "sit-ups."