21. - Choose which the best description of Sternocleidomastoid Muscle is A. It o
ID: 192521 • Letter: 2
Question
21. - Choose which the best description of Sternocleidomastoid Muscle is A. It originates in Manubrium of sternum and medial portion of clavicle and inserts in the Mastoid process of B. C. It is Large, fan-shaped, covering superior portion of chest, anterior axilla fold. It adducts and medially rotates D. It is a strong muscle that is immediately deep biceps brachii on distal humerus. It is a major forearm flexor temporal bone and superior nuchal line of occipital bone. It Flexes and laterally rotates the head. This muscle encircles mouth and inserts into muscle and skin at angle of mouth, it closes lips; purses and protrudes lips, kissing and whistling. 9 arm E. It originate in superior tibia and fibula and interosseous membrane and its tendon passes behind medial malleolus and under arch of foot, inserts into several tarsals and metatarsals II-IV. It is a prime mover of foot inversion 22. Choose which the best description of Pectoralis Major Muscle is It originates in Manubrium of sternum and medial portion of clavicle and inserts in the Mastoid process of temporal bone and superior nuchal line of occipital bone. It Flexes and laterally rotates the head. A. B. This muscle encircles mouth and inserts into muscle and skin at angle of mouth, it closes lips; purses and C. D. it is a strong muscle that is immediately deep biceps brachii on distal humerus. It is a major forearm flexor protrudes lips, kissing and whistling It is Large, fan-shaped, covering superior portion of chest, anterior axilla fold. It adducts and medially rotates arm It originate in superior tibia and fibula and interosseous membrane and its tendon passes behind medial malleolus and under arch of foot, inserts into several tarsals and metatarsals I-IV. It is a prime mover of foot inversion E.Explanation / Answer
21. Sternocleidomastoid is a paired muscle found in superficial layes along the sides of the neck. The activity of muscle causes to rotate the head and flexion of the neck. The muscle mainly originates at the manubrium of the sternum and the clavicle and has an insertion at the mastoid process of the temporal bone and at superior nuchal line of occipital bones of the skull. Thus, the muscle got its name as sternocleidomastoid muscle. Thus, the option A is correct.
22. Pectoralis major is a big fan shaped muscle in the chest region. It contributes to add the bulk to chest muscles underlying the breast. Its major function is movement of shoulder joint and flexion and adduction of humerus. The option C is correct.
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