Pectoralis Major
Origin:
1.❌ of the ❌ of the ❌
2. ❌ of the ❌ of the ❌
3. ❌ of the ❌
Insertion:
1. ❌ 2 or 3 inches wide to ❌ of the ❌ of the humerus
Action:
1.Upper fibers (clavicular head): ❌ rotation, ❌ adduction, ❌, ❌ (once arm is ❌, upper fibers assist in further abduction), & ❌ (with arm ❌)
2. Lower fibers (sternal head): ❌, ❌, ❌, & adduction
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anterior surface
anterior surface
Anterior surface
Anterior surface
costal cartilages
costal cartilages
first six ribs
first six ribs
Adjoining portion
Adjoining portion
intertubercular groove
intertubercular groove
abducted 90 degrees
abducted 90 degrees
below 90 degrees of abduction
below 90 degrees of abduction
internal rotation
internal rotation
horizontal adduction
horizontal adduction
extension from flexed position
extension from flexed position