Flexor Pollicis Brevis Muscle. Anatomical Study and Clinical Implications.

Authors :: Caetano EB
Nakamichi YDC
Alves de Andrade R
Sawada MM
Nakasone MT
Vieira LA
Sabongi RG
Source :: The open orthopaedics journal [Open Orthop J] 2017 Nov 23; Vol. 11, pp. 1321-1329. Date of Electronic Publication: 2017 Nov 23 (Print Publication: 2017).
Publication Year :: 2017
Abstract: Introduction: This paper reports anatomical study of nature, incidence, innervation and clinical implications of Flexor Pollicis Brevis muscle (FPB).<br />Material and Methods: The anatomical dissection of 60 limbs from 30 cadavers were performed in the Department of Anatomy of Medical School of Catholic University of São Paulo.<br />Results: The superficial head of FPB has been innervated by the median nerve in 70% and in 30% it had double innervation. The deep head of FPB were absent in 14%, in 65%, occurred a double innervation. In 17.5% by deep branch of ulnar nerve and in 3.6% by recurrent branch of median nerve.<br />Conclusion: The pattern of innervation more frequent in relationship to the flexor pollicis brevis muscle and should be considered as a normal pattern is that superficial head receives innervation of branches of median nerve and the deep head receives innervation of ulnar and median nerve.