Tendon sheath

{{short description|Lubricating fluid membrane around a tendon}}

{{Infobox anatomy

| Name = Tendon sheath

| Latin = vagina tendinis

| Image =

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A tendon sheath is a layer of synovial membrane around a tendon.{{cite web

|url= http://www.mhhe.com/biosci/abio/glossary.mhtml

|title= Anatomy and Physiology Glossary

|author=

|date= 2001

|website= McGraw-Hill Applied Biology Resource Center

|publisher= McGraw-Hill

|accessdate=2016-02-22

}} It permits the tendon to stretch{{DorlandsDict|nine/100012510|tendon sheath}} and not adhere to the surrounding fascia. It contains a lubricating fluid (synovial fluid) that allows for smooth motions of the tendon during muscle contraction and joint movements.{{cite book |last1=Betts |first1=J. Gordon |title=Anatomy & physiology |chapter=9.4 Synovial joints |date=2013 |publisher=OpenStax |location=Houston, Texas |isbn=978-1-947172-04-3 |url=https://openstax.org/books/anatomy-and-physiology/pages/9-4-synovial-joints |access-date=16 April 2023}}

It has two layers:

• synovial sheath
• fibrous tendon sheath

Fibroma of the tendon sheath has been described.{{Cite journal

| author1 = Ciatti| first2 = P.

| title = Fibroma of tendon sheath located within the ankle joint capsule

| journal = Journal of Orthopaedics and Traumatology

| volume = 10

| issue = 3

| pages = 147–150

| year = 2009

| pmid = 19644650

| pmc = 2744735

| doi = 10.1007/s10195-009-0058-2

| last2 = Mariani

}}{{Cite journal

| author1 = Okada| first2 = T.| first3 = J.| first4 = T.| first5 = K.

| title = Fibroma of tendon sheath of the infrapatellar fat pad in the knee

| journal = Clinical Imaging

| volume = 33

| issue = 5

| pages = 406–408

| year = 2009

| pmid = 19712825

| doi = 10.1016/j.clinimag.2008.11.029

| last2 = Shinozaki

| last3 = Hirato

| last4 = Yanagawa

| last5 = Takagishi

}}