Surface markings, actions and nerve supply of Pectoralis major
Curriculum
| Origin | Clavicle, aponeurosis of the abdominal external oblique muscle, Sternum + upper 6 costal cartilages |
| Insertion | Lateral lip of Bicipital groove of Humerus |
| Nerve supply | Medical and Lateral Pectoral nerves |
| Actions | Flexion, Adduction and Medical rotation of arm |
Pectoralis major Origin and Insertions – Image modified from BodyParts3D, © The Database Center for Life Science licensed under CC Attribution-Share Alike 2.1 Japan
The Pectoralis Major muscle makes the bulk of chest muscles. It originates from 3 different zones – Clavicular, Abdominal and Sterno-costal. Check the images above.
Regarding actions, if the muscle contracts what happens to the Humerus? As it’s attaching on the front side of bone, you’ll expect some rotation to happen.
Last Updated on April 14, 2021 by Admin