intertubercular sheath

in·ter·tu·ber·cu·lar sheath

(in'tĕr-tū-bĕr'kyū-lăr shēth)
The extension of the synovial membrane of the shoulder joint downward in the intertubercular groove to surround the tendon of the long head of the biceps.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012