Pectoralis Major
From WikiLectures
| English: Pectoralis major muscle Latin: Musculus pectoralis major |
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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.
- Pulling the humerus towards the midline of the body anteriorly.
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>.
