Lateral Pectoral Nerve

nervus pectoralis lateralis

The lateral pectoral nerve is the more superior and important of the two pectoral nerves, supplying primarily the clavicular head of the pectoralis major. Despite the confusing name (lateral nerve supplies medial muscle, medial nerve supplies lateral muscle), the naming refers to the nerve's origin from the lateral cord of the brachial plexus. It is the nerve most important for preserving the upper pectoralis major function that gives the male chest its characteristic appearance.

Region: Chest

Anatomical Data

Origin, Insertion & Supply

Origin	Lateral cord of the brachial plexus (C5, C6, C7)

Clinical Relevance

Clinical Notes

The lateral pectoral nerve can be compromised during cephalic vein-deltopectoral groove dissection and during lymph node dissection for apical axillary disease. Its preservation is emphasised in prepectoral breast reconstruction where implants are placed in front of the muscle and nerve damage could produce the visible abnormality of clavicular head pectoralis atrophy.

Pathology

Common Injuries & Conditions

Lateral Pectoral Nerve Palsy

Weakness of the clavicular pectoralis major from nerve damage during axillary or shoulder surgery, producing visible clavicular head atrophy and weak shoulder adduction from the front.