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Monday October 13, 2008
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Muscles of the Upper Extremity / Pectoralis Major
Page: 1
| Origin |
Clavicular head: anterior surface of medial half of clavicle
Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle |
| Insertion |
Lateral lip of intertubercular groove of humerus |
| Action |
Adducts and medially rotates humerus; draws scapul anteriorly and inferiorly
Acting alone: clavicular head flexes humerus and sternocostal head extends it |
| Innervation |
Lateral and medial pectoral nerves; clavicular head (C5 and C6, sternocostal head (C7, C8, and T1) |
Arterial
Supply |
pectoral branch of the thoracoacromial trunk | |
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