Pectoralis Major

From WikiLectures


English: Pectoralis major muscle
Latin: Musculus pectoralis major
Dictionary


Pectoralis major muscle

Pectoralis major muscle (lat. musculus pectoralis major) is a muscle on the anterior part of the chest.

Origin
It arises from the anterior surface of the sternal part of the clavicle (pars clavicularis), from the sternum (pars sternalis) and from the cartilages of the true ribs (pars abdominalis).
Insertion
The muscle is inserted into the greater tubercle of the humerus.
Inervation
lateral (C8, Th1) and medial (C5–C7) pectoral nerves (plexus brachialis).
Function
  • flexion of humerus;
  • horizontal adduction;
  • inward rotation;
  • secondary inspiratory muscle.


Links[✎ edit | edit source]

Sources[✎ edit | edit source]

Wikiskripta. Musculus pectoralis major [online]. Wikiskripta, ©2011. The last revision 2011-06-13, [cit. 2011-07-19]. <http://www.wikiskripta.eu/index.php/M._pectoralis_major>.