The median nerve recurrent branch and common palmar digital branches divide to supply the thenar muscles and the digital nerves for the thumb, index, and middle fingers. The second common digital nerve supplies the adjacent sides of the index and middle fingers across the second web space.
| Origin | Median nerve at the distal border of the flexor retinaculum (second common palmar digital nerve) |
|---|---|
| Course | Runs distally in the palm deep to the superficial palmar arch and divides near the second web space into proper digital nerves for the adjacent sides of the index and middle fingers |
| Motor |
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| Sensory |
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The second web space median common digital nerve is the specific territory distinguishing median from ulnar nerve injury in the palm. Morton's neuroma equivalent in the second web space of the hand (index-middle web) involves this nerve. Two-point discrimination across the index-middle web space tests this nerve territory specifically.
Median common digital nerve injury producing numbness at the adjacent index-middle finger web space, assessed by two-point discrimination and repaired microsurgically for transection injuries.
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