The other membrane is the outer fibrous tendon sheath.
The mesotendon disappears or remains in the form of narrow tendinous bands as threads known as vincula tendina.
[citation needed] The synovial sheath is found where the tendon passes under ligaments and through osseofibrous tunnels; their function is to reduce friction between the tendon and their surrounding structure.
[citation needed] An example is the common synovial sheath for the flexor tendons of the hand.
This human musculoskeletal system article is a stub.