Extensor expansion of foot
Aponeurosis extensoria pedis
- Synonym: Extensor hood; Dorsal digital expansion of foot
Definition
On the dorsal surface of each toe, the extensor digitorum tendon becomes incorporated into a fascial expansion termed the “Extensor expansion of foot” (sometimes referred as extensor hood or extensor hood apparatus).
The extensor expansion of foot is a fibrous sheath that encloses several tendons that pass across the metatarsophalangeal joints. It may be absent at the first metatarsophalangeal joint.
Distally, the extensor expansion of foot divides into tree bands:
One central band that attaches to the base of the middle phalanx
Two collateral bands that attach to the distal phalanx
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