Palmaris brevis muscle
The muscle fibres are inserted into the skin on the ulnar border of the palm of the hand,[1] and occasionally on the pisiform bone.The muscle was independently discovered a few years later by Realdo Colombo before being pushed to general acceptance in the works of Andreas Vesalius.[4] Palmaris brevis muscle tenses the skin of the palm on the ulnar side during a grip action.[6] The muscle has a fatigue-resistant fiber type profile, which supports the idea of a protective function to the ulnar neurovasculature during repetitive intermittent grasping tasks.[7] This article incorporates text in the public domain from page 463 of the 20th edition of Gray's Anatomy (1918)