Supraclavicular nerve
- Arises from the cervical plexus (C3, C4) and innervates the skin over the upper pectoral, deltoid, and outer trapezius areas.
Medial brachial cutaneous nerve
- Arises from the medial cord of the brachial plexus and innervates the medial side of the arm.
Medial antebrachial cutaneous nerve
- Arises from the medial cord of the brachial plexus and innervates the medial side of the forearm.
Lateral brachial cutaneous nerve
- Arises from the axillary nerve and innervates the lateral side of the arm.
Lateral antebrachial cutaneous nerve
- Arises from the musculocutaneous nerve and innervates the lateral side of the forearm.
Posterior brachial and antebrachial cutaneous nerves
- Arise from the radial nerve and innervate the posterior sides of the arm and forearm, respectively.
Intercostobrachial nerve
- Is the lateral cutaneous branch of the second intercostal nerve and emerges from the second intercostal space by piercing the intercostal and serratus anterior muscles.
- May communicate with the medial brachial cutaneous nerve.
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