Pectoralis Major
Description
Name
- Pectoralis Major
- Pecs
- Pectoral muscle
- Chest muscle
General
- Think, fan shaped triangular muscle of the human chest
- Makes up the bulk of the chest muscles
- It is a powerful internal rotator/ adductor of the arm
Origin
Insertion
- Bicipital 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[3]
- Also contributes to shoulder flexion when arm is extended or neutral
- Contributes to extension when arm is forward flexed
Vascular Supply
- Pectoral branch of thoracoacromial artery (60%)
- Clavicular branch of thoracoacromial artery (20%)
- Internal mammary artery (20%)
Innervation
Clinical Significance
See Also
- Shoulder Pain (Main)
- Shoulder Anatomy (Main)
- Chest Pain (Main)
- Chest Anatomy (Main)
- Physical Exam Shoulder
References
- ↑ Fung, Peter Chin Wan, and Regina Kit Chee Kong. "A novel apprehension of the primary lung meridian, sinew channel, divergent channel, luo-connecting channel acting as a single unit system to serve respiration function based on modern neurophysiology and kinesiology." Chinese Medicine 11.2 (2020): 31-95.
- ↑ Butt, Usman, et al. "Pectoralis major ruptures: a review of current management." Journal of shoulder and elbow surgery 24.4 (2015): 655-662.
- ↑ 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.