Posterior cutaneous nerve of forearm

It arises from the radial nerve in the posterior compartment of the arm, often along with the posterior cutaneous nerve of the arm.

It perforates the lateral head of the triceps brachii muscle at the triceps' attachment to the humerus.

The upper and smaller branch of the nerve passes to the front of the elbow, lying close to the cephalic vein, and supplies the skin of the lower half of the arm.

The lower branch pierces the deep fascia below the insertion of the deltoideus, and descends along the lateral side of the arm and elbow, and then along the back of the forearm to the wrist, supplying the skin in its course, and joining, near its termination, with the dorsal branch of the lateral antebrachial cutaneous nerve.

• Medial cutaneous nerve of forearm
• Lateral cutaneous nerve of forearm
• Posterior cutaneous nerve of arm

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  Cross-section through the middle of upper arm.
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  Cutaneous nerves of right upper extremity.

  This article incorporates text in the public domain from page 944 of the 20th edition of Gray's Anatomy (1918)

• lesson5nervesofpostforearm at The Anatomy Lesson by Wesley Norman (Georgetown University)

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