We need you! See something you could improve? Make an edit and help improve WikSM for everyone.
Pectoralis Major
From WikiSM
Origin
Insertion
- Bicepital groove of the Humerus
Actions
- Not necessary for activities of daily living
- Important for athletic or labor intensive activities
- Powerful adductor, internal rotator of the arm[1]
- Also contributes to shoulder flexion when arm is extended or neutral
- Contributes to extension when arm is forward flexed
Artery
- Pectoral branch of thoracoacromial artery (60%)
- Clavicular branch of thoracoacromial artery (20%)
- Internal mammary artery (20%)
Nerve
- Lateral pectoral nerve (C5, C6)
- Middle pectoral nerve (C7)
- Medial pectoral nerve (C8, T1)
Clinical Significance
See Also
- Shoulder Pain (Main)
- Shoulder Anatomy (Main)
- Chest Pain (Main)
- Chest Anatomy (Main)
- Physical Exam Shoulder
- ↑ 48. Marmor, L, Bechtol, CO, Hall, CB. Pectoralis major muscle: function of sternal portion and mechanism of rupture of normal muscle: case reports. J Bone Joint Surg Am. 1961;43(1):81-87.