pectoralis major

Introduction

Superficial muscle of the chest wall.

Origin

• medial 1/2 of clavicle
• anterior surface of manubrium
• body of sternum
• cartilages to the 1st 6 ribs
• aponeurosis of the external oblique muscle

Insertion

crest of greater tubercle of humerus

Action

adducts & medially rotates arm

Innervation

anterior thoracic nerve

More general terms

• skeletal muscle (voluntary muscle)