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lateral pectoral nerve
The lateral nerve (lateral anterior thoracic nerve) arises from the lateral cord of the brachial plexus, and through it from the fifth, sixth, seventh and eighth cervical nerves.
It passes across the axillary artery and vein, pierces the clavipectoral (coracoclavicular) fascia, and is distributed to the deep surface of the Pectoralis major muscle.
==Function==
It sends a filament to join the medial (pectoral) anterior thoracic nerve and form with it a loop in front of the first part of the axillary artery.
Although this nerve is described as mostly motor, it also has been considered to carry proprioceptive and nociceptive fibers. It arises either from the lateral cord or directly from the anterior divisions of the upper and middle trunks of the brachial plexus, unlike the medial pectoral nerve, which derives from the medial cord (or directly from the anterior division of the lower trunk). It splits into four to seven branches that pierce the clavipectoral fascia to innervate the entire pectoralis major or its superior portion. The medial and lateral pectoral nerves form a connection, or loop, around the axillary artery, called ansa pectoralis. The lateral pectoral nerve has been described as double, while the medial pectoral nerve has been described as single.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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