The dorsal subaponeurotic space lies on the back of the hand between the extensor tendons and their thin aponeurosis above and the metacarpals and dorsal interossei below. A separate dorsal subcutaneous space lies above it, under the loose skin.
| Location | Dorsum of the hand, deep to the extensor tendons. |
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Allows the extensor tendons to glide over the metacarpals.
Most swelling on the back of the hand is due to the lymphatic drainage of the palm passing dorsally, so infections in the palm often show as dorsal swelling. True infection of the subaponeurotic space usually follows penetrating injuries, such as a punch against teeth, and needs drainage.
Infection under the extensor tendons on the back of the hand, often after a bite or puncture wound, causing swelling, redness and pain on finger flexion.
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