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The Palmaris Brevis-A Reconsideration of Its Anatomy and Possible Function
M. M. SHREWSBURY; R. K. JOHNSON; D. K. OUSTERHOUT
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From the Department of Anatomy, San Jose State College, San Jose, and the Department of Surgery, Stanford University, Palo Alto
1972 by The Journal of Bone and Joint Surgery, Incorporated
J Bone Joint Surg Am, 1972 Mar 01;54(2):344-348
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Abstract

1. An amplified description of the anatomy of the palmaris brevis muscle based on dissections of ten cadaver hands is reported. Specific details regarding its shape, attachments, its bipartite structure with separate innervation to each part, and presence of tendons are noted.

2. Structural boundaries of the pisohamate tunnel (loge of Guyon) are described, based on these dissections.

3. The function of the palmaris brevis is believed to be to protect the ulnar nerve and artery from overlying pressure. Contraction of the muscle appears to prevent displacement of the hypothenar pad by the pressure produced by gripping hard objects. As a result this pad of soft tissue is maintained over the ulnar neurovascular bundle and the risk of trauma to the nerve and artery from prolonged pressure is minimized.

4. In view of this possible function, we believe that in the surgical approach to this region the integrity of the palmaris brevis should be preserved.

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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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