The hypothenar compartment forms the fleshy ulnar border of the palm. It contains abductor digiti minimi, flexor digiti minimi brevis and opponens digiti minimi, supplied by the deep branch of the ulnar nerve.
| Location | Ulnar side of the palm. |
|---|---|
| Boundaries |
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| Contents |
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Holds the muscles that move the little finger and shape the ulnar side of the grip.
Hypothenar wasting suggests ulnar nerve damage at the elbow or in Guyon canal. Repeated striking with the heel of the hand can injure the ulnar artery next to this compartment, causing hypothenar hammer syndrome. The compartment is released through an ulnar incision in hand compartment syndrome.
Damage to the ulnar artery from repeated use of the heel of the hand as a hammer, causing aneurysm or thrombosis and cold, painful fingers.
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