Tendon Sheath of Extensor Pollicis Longus
Vagina tendinis extensoris pollicis longi
Read moreAnatomical Relations
The tendon sheath of the extensor pollicis longus muscle passes deep to the extensor retinaculum, within its own compartment on the medial aspect of the dorsal tubercle of the distal radius and continues to the base of the first metacarpal.
Related parts of the anatomy
Structure
The tendon sheath of the extensor pollicis longus brevis has an outer fibrous component and an inner double layered sheath of synovial membrane that is akin to a longitudinal bursa. The synovial layer is composed of an inner visceral layer and an outer parietal layer. The synovium produces a thin layer of lubricating fluid between the visceral and parietal layers which surround the tendons.
Function
The tendon sheath of the extensor pollicis longus muscle provides a well-lubricated, smooth surface that reduces friction during movements of the tendons.
List of Clinical Correlates
—Tendovaginitis
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Tendon Sheath
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).
