The adductor compartment of the hand is the deep compartment that holds adductor pollicis, lying between the thumb and the third metacarpal in the web space. It is supplied by the deep branch of the ulnar nerve.
| Location | Deep part of the first web space and thenar region. |
|---|---|
| Boundaries |
|
| Contents |
Contains the muscle that pulls the thumb toward the palm for strong pinch.
This compartment is released through a dorsal incision in the first web space in hand compartment syndrome. Weakness of adductor pollicis in ulnar nerve palsy causes Froment sign, where the thumb flexes at the interphalangeal joint to grip a sheet of paper.
Weak adductor pollicis from ulnar nerve damage, so the patient flexes the thumb tip using flexor pollicis longus to pinch paper.
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