Fibrous sheath
Vagina fibrosa
- Latin synonym: Stratum fibrosum vaginae tendinis
- Synonym: Fibrous layer of tendon sheath
Definition
The fibrous sheath is the outer layer of a tendon sheath, composed of dense fibrous connective tissue that forms a strong tubular covering around the tendon. It functions to protect and guide the tendon, maintaining its position close to the underlying bone during movement.
In regions such as the fingers and toes, the fibrous sheath attaches to the bones and fibrous pulleys, creating an osseofibrous tunnel through which the tendon passes. This arrangement prevents bowstringing of the tendon during flexion or extension.
Function
Provides mechanical protection and stability for the tendon.
Maintains alignment and enables smooth, controlled movement within the sheath.
Example
The fibrous flexor sheath of the digits encloses the flexor tendons and their synovial sheath, ensuring efficient finger flexion.
References
InformedHealth.org [Internet]. Cologne, Germany: Institute for Quality and Efficiency in Health Care (IQWiG); 2006-. In brief: What are tendons and tendon sheaths? [Updated 2022 Mar 30]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK525770/
Gray, H. (2016) Gray’s anatomy the anatomical basis of clinical practice. 41st edition. Edited by S. Standring. New York: Elsevier.
