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Tendon Sheath of Extensor Hallucis Longus
Connective Tissue

Tendon Sheath of Extensor Hallucis Longus

Vagina tendinis extensoris longi hallucis

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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 hallucis longus muscle covers the tendon of this muscle as it travels deep to both the superior and inferior extensor retinaculae, along the anterior aspect of the ankle. The sheath extends as far as the base of the first metatarsal.

Function

The tendon sheath ensures that the tendon of the extensor hallucis longus muscle can glide over adjacent structures and allow for minimal friction during movement. Additionally, the tendon sheath produces synovial fluid, ensuring that the tendon is well lubricated.

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Tendon Sheath

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Tenosynovectomy refers to the excision of thickened tendon sheath and other tissue surrounding a tendon, commonly seen in infection, chemical irritation, and rheumatoid arthritis (synovectomy).

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