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Tendon sheath is the name of the tubular double-layered
sacs that surround some tendons.
(Tendons
are tough pale/whitish cords that attach muscles
to bones.
Compare with ligaments, which attach bones to bones and are also inelastic,
yet flexible.)
Tendon sheaths are tubular double-layered
sacs lined with synovial membrane and containing synovial fluid.
Tendon sheaths enclose many tendons, including the flexor tendons of the
wrist and ankle where they perform the important function of keeping
friction as low as possible, while faciliating movement of the joint.
Disorder of Tendon Sheaths:
Tenosynovitis is
an inflammation of the tendon sheath.
This can occur as a result of repeated
or prolonged activities, including for example - forceful exertion,
and local mechanical stress that cause the lubrication system of the
tendon sheath to break down. This can lead to
friction between the tendon and its sheath, causing inflammation and
swelling of the tendon sheath. If this happens repeatedly then fibrous
tissue may form, thickening
the tendon sheath and hindering movement of the tendob.
This Section consists of short summaries about the
structures that form the muscles of the body.
This list is not exhaustive but is intended to be appropriate for students
of A-Level Human Biology, ITEC courses in massage and related subjects,
and some other courses in Health Sciences.
For more general information about Muscles see
the pages about: Anterior
Muscles, Posterior
Muscles, Facial
Muscles, Terminology
about Muscles, and the Structure
of Muscles.
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