Pectoralis major
Pectoralis Major
The Pectoralis Major is a thick, fan-shaped muscle, situated at the chest (anterior) of the human body. It makes up the bulk of the chest muscles in the male and lies under the breast in the female.
Anatomy[edit]
The Pectoralis Major muscle arises from the anterior surface of the sternum, the superior six costal cartilages, and the aponeurosis of the abdominal external oblique muscle. It has two parts: the clavicular part and the sternocostal part.
Function[edit]
The Pectoralis Major has several functions. It adducts and medially rotates the humerus. It also draws the scapula anteriorly and inferiorly. The Pectoralis Major is also responsible for keeping the arm attached to the trunk of the body.
Clinical significance[edit]
Injuries to the Pectoralis Major are rare but can occur in weightlifting, wrestling, and other activities that require extensive use of the upper body. Treatment for these injuries can range from rest and physical therapy to surgery.
See also[edit]
References[edit]
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External links[edit]
- Pectoralis Major on PubMed Health
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