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Elsevier
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Tendon Sheath of Extensor Digitorum Longus
Connective Tissue

Tendon Sheath of Extensor Digitorum Longus

Vagina tendinum extensoris longi digitorum

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Structure

Several tendons originating from muscles in the leg traverse the ankle to enter the foot. They pass beneath retinacula which holds the tendons in place, preventing subluxation. These tendons are covered by modified bursae, called tendon sheaths, which minimize friction with the surrounding structures. The sheaths, composed of both fibrous and synovial layers, wrap around the tendons, ensuring that the tendons can glide over adjacent structures and allow for minimal friction during movement.

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Anatomical Relations

The tendon sheath of the extensor digitorum longus muscle covers the tendon of this muscle, as well as the tendon of the fibularis tertius, as they travel deep to the superior and inferior extensor retinacula, along the anterior aspect of the ankle.

Function

The tendon sheath ensures that the tendons of the extensor digitorum longus and fibularis tertius muscles can glide over adjacent structures and allow for minimal friction during movement. Additionally, the tendon sheath produces synovial fluid, ensuring that the tendons are well lubricated.

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The world's most advanced 3D anatomy platform

Complete Anatomy