💪 Pectoralis Major
Brian Lee
May 21 2025
Content
Summary
Summary
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Origin
Medial half of clavicle, sternum, and costal cartilages of ribs 1–6 (sometimes 1–7)
Insertion
Crest of the greater tubercle of the humerus (lateral lip of bicipital groove)
Actions
Flexes the shoulder (especially the clavicular head)
Adducts the shoulder
Medially rotates the shoulder
Assists in extending the shoulder from a flexed position (sternal head)