The terminal sensory branch of the deep peroneal nerve supplies the adjacent skin of the first and second toes in the first web space — the only cutaneous territory of the deep peroneal nerve in the foot. This branch separates from the motor branch to EDB as the nerve crosses the ankle.
Numbness or tingling confined to the first web space is the hallmark of deep peroneal nerve compression (anterior tarsal tunnel syndrome). The first web space test — comparing sensation between the first and second toes — is the most sensitive clinical test for this condition. Tight footwear, dorsal osteophytes, and ganglion cysts are the most common compressive causes. Preservation of EDB strength with isolated first web space numbness indicates the lesion is distal to the EDB motor branch.
Isolated sensory loss in the first web space from deep peroneal nerve terminal branch compression under tight footwear or by dorsal foot osteophytes, confirming anterior tarsal tunnel syndrome.
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