The common flexor sheath of hand or the ulnar bursa[1] is a synovial sheath in the carpal tunnel of the human hand.

[2] The sheath which surrounds the flexor digitorum extends downward about halfway along the metacarpal bones, where it ends in blind diverticula around the tendons to the index, middle, and ring fingers.

It is prolonged on the tendons to the little finger and usually communicates with the synovial sheath of these tendons.

This article incorporates text in the public domain from page 457 of the 20th edition of Gray's Anatomy (1918)

This human musculoskeletal system article is a stub.