Medial pectoral nerve
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The medial pectoral nerve arises from the medial cord of the brachial plexus with fibers arising from the eighth cervical and first thoracic nerve roots.
The medial pectoral nerve arises posterior to the axillary artery. It curves anteriorly to lie between the axillary artery and vein then, after receiving a communicating branch from the lateral pectoral nerve (the ansa pectoralis) enters the deep surface of the pectoralis minor muscle. The medial pectoral nerve perforates the pectoralis minor muscle and enters the deep surface of pectoralis major supplying the lower sternocostal fibers of the muscle.
Branches and supply
The medial pectoral nerve supplies both the pectoralis minor muscle and sternocostal portions of the pectoralis major muscle.
The medial pectoral nerve lies posterior to the axillary artery and anterior to the axillary vein. Along its course it receives a communicating branch from the lateral pectoral nerve to form a loop (ansa pectoralis) which runs anteriorly to both the axillary artery and vein.
The medial pectoral nerve may arise directly from the anterior division of the inferior trunk of the brachial plexus.
- 1. Moore KL, Agur AMR, Dalley AF. Clinically oriented anatomy. LWW. ISBN:1451119453. Read it at Google Books - Find it at Amazon
- 2. Last's anatomy, regional and applied. Churchill Livingstone. ISBN:044304662X. Read it at Google Books - Find it at Amazon
- 3. Shetty P, Nayak SB, Kumar N et-al. Origin of medial and lateral pectoral nerves from the supraclavicular part of brachial plexus and its clinical importance - a case report. J Clin Diagn Res. 2014;8 (2): 133-4. doi:10.7860/JCDR/2014/7082.4029
- 4. Kg P, K S. Anatomical study of pectoral nerves and its implications in surgery. J Clin Diagn Res. 2014;8 (7): AC01-5. doi:10.7860/JCDR/2014/8631.4545