The lateral pectoral nerve is a motor nerve arising from the lateral cord of the brachial plexus.
It supplies motor innervation to the pectoralis major and contributes to the innervation of pectoralis minor.
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Course
The lateral pectoral nerve originates from the lateral cord of the brachial plexus, containing fibres from C5-7.
It first passes anterior to the axillary artery. Here, it commonly gives rise to a communicating branch which joins the medial pectoral nerve – forming the ansa pectoralis.
It then pieces the costocoracoid membrane, before terminating at the deep surface of the pectoralis major muscle.
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Motor Functions
The lateral pectoral nerve provides motor innervation to the pectoralis major. It also contributes to the innervation of the pectoralis minor muscle via the ansa pectoralis.
