Inferior Extensor Retinaculum Anatomy, Perform & Diagram

A retinaculum refers to any area on the physique the place tendon teams from completely different muscle tissues cross below one connective tissue band. The inferior extensor retinaculum is situated on the entrance of the ankle joint and is Y-shaped. The stem of this Y-shaped band is hooked up in a lateral (sideways) path to the calcaneus bone’s higher floor. (The calcaneus is the medical time period for the heel bone.) This band can be situated in entrance of the interosseous talocalcaneal ligament, which is what kinds the union bond between the calcaneus and the talus, or ankle bone.

The inferior extensor retinaculum is taken into account a double layer on account of one lamina (skinny sheet) passing behind and the opposite passing in entrance of the tendons of the extensor digitorum longus and the peroneus tertius. The extensor digitorum longus muscle is situated on the lateral (aspect) portion of the entrance a part of the leg. The peroneus tertius muscle can be situated within the decrease limb. The 2 layers of the inferior extensor retinaculum come collectively to type a compartment that encloses these tendons.

Close to the band’s center, the Y’s two limbs cut up — one going upward, towards the ankle, and the opposite towards the center of the foot — and each cross over the tendon of the extensor hallucis longus. The higher portion attaches to the tibial malleolus (the inner-bottom of the shinbone) and the opposite attaches to the plantar aponeurosis, a thick band of tissue within the arch of the foot.

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