Abstract
IntroductionLumbrical muscles play a vital role in the precision movements of the hand, along with the thenar, hypothenar and interossei muscles. The variation in the lumbrical muscle is clinically significant.Case presentationDuring routine dissection of an adult male cadaver, we observed an additional muscle belly of the first lumbrical muscle took origin from the tendon of the flexor digitorum superficialis (FDS) to the index finger, close to the proximal margin of the flexor retinaculum.ConclusionThe presence of such an additional muscle in the carpal tunnel should be considered in the aetiology of carpal tunnel syndrome (CTS).
Highlights
Lumbrical muscles play a vital role in the precision movements of the hand, along with the thenar, hypothenar and interossei muscles
Each muscle forms a narrow tendon and on reaching the dorsal surface of the proximal phalanx joins the margin of the dorsal digital expansion (DDS) [1]
The first lumbrical muscle took origin from the radial side of the flexor digitorum profundus (FDP) tendon for the index finger as expected (Fig 1). Both the first lumbrical muscle and the accessory muscle belly were innervated by a twig from the median nerve
Summary
Lumbrical muscles play a vital role in the precision movements of the hand, along with the thenar, hypothenar and interossei muscles. Lumbrical muscle variation has been reported in the literature by various authors [2,3,4,5,6]. Mehta and Gardner described the anomalous origin of first lumbrical in 2.7% cases they studied [7].
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