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Tendon Sheath of Flexor Pollicis Longus
Connective Tissue

Tendon Sheath of Flexor Pollicis Longus

Vagina tendinis flexoris longi pollicis

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Anatomical Relations

The tendon sheath containing the flexor pollicis longus courses distally, deep to the flexor retinaculum within the carpal tunnel and lateral to the common flexor sheath. The sheath for the flexor pollicis longus is contiguous with the sheath for the flexor digitorum (Standring, 2016; Moore, Dalley and Agur, 2013).

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Structure

The tendon sheath of the flexor pollicis longus 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 flexor pollicis longus provides a well-lubricated, smooth surface that reduces friction during movement of the tendon.

List of Clinical Correlates

—Tendovaginitis

References

Moore, K. L., Dalley, A. F. and Agur, A. M. R. (2013) Clinically Oriented Anatomy. Clinically Oriented Anatomy 7th edn.: Wolters Kluwer Health/Lippincott Williams & Wilkins.

Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

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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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