PECTORALIS MAJOR

Question 1

Origin of Pectoralis Major

Answer 1

Medial 3rd of Clavicle, Sternum, and costal cartilage of first 6 ribs.

Question 2

Insertion of Pectoralis Major

Answer 2

Lateral lip of bicipital groove of humerus.

Question 3

Action of Pectoralis Major

Answer 3

• CLAVICULAR PORTION: Shoulder flexion to approximately first 60*.
• STERNAL PORTION: Shoulder extension to approximately first 60* (180-120*).
• BOTH: Shoulder adduction, medial rotation, and horizontal adduction.

Question 4

Nerve of Pectoralis Major

Answer 4

Lateral and medial pectoral nerve.