Stack #61643: Mass 292 week 4
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| Subclavius | first rib | clavicle | depresses and moves clavicle anteriorly and helps stabilize pectoral girdle | subclavian
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| Serratus anterior | superior 8 or 9 ribs | vertebral border and inferior angle of scapula | ABDUCTS scapula and rotates it upward; elevates ribs when scapula is stabilized, known as "boxer's muscle" (punching and pushing) | long thoracic
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| Pectoralis major | clavicle, sternum, and costal cartilages of ribs 2-6 | greater tubercle and lateral lup of the intertubercular sulcus of humerus | as a whole, adducts and medially rotates arm at shoulder, clavicular head also extends the flexed arm to side of trunk | medial and lateral pectoral
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| Pectoralis minor | ribs 2-5, 3-5, or 2-4 | coracoid process of scapula | ABDUCTS scapula and rotates it downward; elevates ribs during forced inhalation when scapula is fixed | medial pectoral
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| Diaphragm | Xiphoid process of sternum, costal cartilages of inferior 6 ribs, lumbar vertebrae and their discs, and rib 12 | central tendon | contraction of the diaphragm causes it to flatten and increase the bertical dimension of the thoracic cavity, resulting in inhalation; relaxation causes it to move superiorly and decreases dimensions, resulting in exhalation | phrenic
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Created by:
sandy
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