|
http://upload.orthobullets.com/topic/10008/images/pectoralis-major.jpg
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 scapula 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) (C5, C6, C7, C8, T1)
Arterial Supply pectoral branch of the thoracoacromial trunk

 

   
 

Please rate topic.

Average 4.4 of 14 Ratings

Questions (1)
Topic COMMENTS (3)
Private Note