Inferior extensor retinaculum of foot

A band of connective tissue in the foot

Inferior extensor retinaculum of foot

The mucous sheaths of the tendons around the ankle. Lateral aspect. (Inferior extensor retinaculum labeled at center right.)
Latin	retinaculum musculorum extensorum inferius pedis
Nerve	Deep fibular nerve
System	Musculoskeletal system

The inferior extensor retinaculum of the foot is a crucial anatomical structure located in the foot. It is a thickened band of fascia that serves to hold the tendons of the extensor muscles in place as they pass over the ankle joint. This retinaculum is part of the extensor retinacula of the foot, which also includes the superior extensor retinaculum.

Anatomy

The inferior extensor retinaculum is Y-shaped and is located on the anterior aspect of the ankle. It is attached laterally to the superior aspect of the calcaneus, and medially it splits into two bands. One band attaches to the medial malleolus, and the other band blends with the fascia over the medial side of the foot.

Structure

The retinaculum is composed of dense regular connective tissue, which provides strength and support to the tendons it covers. It is continuous with the deep fascia of the leg and foot.

Relations

The inferior extensor retinaculum covers the tendons of the following muscles:

• Tibialis anterior
• Extensor hallucis longus
• Extensor digitorum longus
• Fibularis tertius

It also covers the dorsalis pedis artery and the deep fibular nerve, which pass beneath it.

Function

The primary function of the inferior extensor retinaculum is to prevent "bowstringing" of the extensor tendons during dorsiflexion of the foot. By holding the tendons close to the bones of the foot, it ensures efficient transmission of muscular forces, allowing for effective movement and stabilization of the foot.

Clinical significance

Injuries or conditions affecting the inferior extensor retinaculum can lead to pain and dysfunction in the foot. For example, extensor tendonitis can occur if the tendons become inflamed due to excessive friction or overuse. Proper diagnosis and treatment are essential to restore normal function.

Also see

• Superior extensor retinaculum of foot
• Extensor tendons of the foot
• Ankle joint
• Dorsiflexion