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

References in periodicals archive ?
The extensor digitorum tendon originated from the lateral condyle of the humerus via the common extensor tendon and passed deep to extensor retinaculum to continue its course towards the digits.
3) It is believed the consequence of this biomechanical overloading is that the extensor retinaculum thickens to resist the cumulative strain.
The tendon of this accessory head passed through a separate tunnel in the extensor retinaculum and inserted in the middle of the first metacarpal bone (Claassen & Wree).
The intermediate layer has two components: the intermediate root of the inferior extensor retinaculum and the cervical ligament.
1,2,5] This was mainly due to a restricted gliding of the APL and EPB tendons in the narrow compartment caused by thickening of the extensor retinaculum and compressing the APL and EPB tendons.
3,4) It is usually caused by overuse or an increase in repetitive activity, resulting in shear microtrauma from repetitive gliding of the first dorsal compartment tendons (abductor pollicis longus or APL, and extensor pollicis brevis or EPB) beneath the sheath of the first compartment over the styloid of the radius leading to thickening of the extensor retinaculum of the wrist (and not related to inflammation as was once thought).

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