Abstract
Introduction:This paper reports anatomical study of nature, incidence, innervation and clinical implications of Flexor Pollicis Brevis muscle (FPB).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.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.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.
Highlights
This paper reports anatomical study of nature, incidence, innervation and clinical implications of Flexor Pollicis Brevis muscle (FPB)
The FPB had two heads; the superficial head arose from the crest of the trapezium and flexor retinaculum are present in sixty hands, and the deep head from the trapezoid and capitate bones and the palmar ligaments of the distal row of carpal bones
The exclusive innervation of the superficial head of flexor pollicis brevis muscle by the ulnar nerve was not verified in our preparations
Summary
This paper reports anatomical study of nature, incidence, innervation and clinical implications of Flexor Pollicis Brevis muscle (FPB). An important part of the evolutionary success of the human being is due to the fact that our thumb is capable of opposing the rest of the hand. Thanks to this feature, we are able to manipulate objects and create tools. The muscles that act on the opposing movement of the thumb are innervated by the median and ulnar nerves. A variety of clinical aspects observed in the isolated lesions of median and ulnar nerves, does not agree with the classic pattern of innervation of the Flexor Pollicis Brevis muscle (FPB) [6, 7].
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