Lateral pectoral nerve

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== Lateral Pectoral Nerve ==

The lateral pectoral nerve is a nerve that arises from the brachial plexus. It is primarily responsible for innervating the pectoralis major muscle, which is a key muscle in the movement of the shoulder joint.

Anatomy

The lateral pectoral nerve originates from the lateral cord of the brachial plexus, which is formed by the anterior divisions of the upper and middle trunks. It carries fibers from the C5, C6, and C7 spinal nerves.

Pathway

The nerve travels anteriorly, passing through the clavipectoral fascia to reach the pectoralis major muscle. It typically runs alongside the thoracoacromial artery and may communicate with the medial pectoral nerve.

Function

The primary function of the lateral pectoral nerve is to provide motor innervation to the pectoralis major muscle. This muscle is involved in several movements of the shoulder, including adduction, flexion, and medial rotation.

Clinical Significance

Injury to the lateral pectoral nerve can result in weakness or paralysis of the pectoralis major muscle, leading to impaired shoulder movement. Such injuries can occur due to trauma, surgical procedures, or compression.

Related Structures

• Brachial plexus
• Medial pectoral nerve
• Pectoralis major
• Thoracoacromial artery
• Clavipectoral fascia

See Also

• Brachial plexus injuries
• Shoulder anatomy
• Nerve injury