extensor retinaculum


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Related to extensor retinaculum: Extensor retinaculum of the hand

ex·ten·sor ret·i·nac·u·lum

[TA]
a strong fibrous band formed as a thickening of the antebrachial deep fascia, stretching obliquely across the back of the wrist, attaching deeply to ridges on the dorsal aspect of the radius, triquetral, and pisiform bones, and binding down the extensor tendons of the fingers and thumb.

ex·ten·sor ret·i·nac·u·lum

(eks-ten'sŏr ret'i-nak'yū-lŭm) [TA]
A strong fibrous band formed as a thickening of the antebrachial deep fascia, stretching obliquely across the back of the wrist, attaching deeply to ridges on the dorsal aspect of the radius, triquetral and pisiform bones, binding down the extensor tendons of the fingers and thumb.

extensor

a muscle, contraction of which tends to straighten or dorsiflex a joint; the antagonist of a flexor

retinaculum (plural: retinacula)

restraining band of fibrous tissue
  • extensor retinaculum bands of thick, fibrous tissue within superficial fascia, at anterior ankle area (subdivided into superior and inferior extensor retinacula) overlying the extensor (dorsiflexor) tendons and synovial sheaths of the extrinsic musculature (i.e. tibialis anterior, extensor hallucis longus, extensor digitorum longus, peroneus tertius)

  • flexor retinaculum bands of thick fibrous tissue within deep fascia, at posterior ankle area, overlying the plantarflexor tendons and synovial sheaths of the extrinsic musculature (i.e. gastrocnemius, soleus, plantaris, tibialis posterior, flexor hallucis longus, flexor digitorum longus, peroneus longus, peroneus brevis); flexor retinaculum is continuous proximally with deep fascia of leg, and distally with deep fascia of the sole, acting as a point of origin of abductor hallucis

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