Anomalous origin of the first lumbrical in the hand and its possible role in Carpal Tunnel Syndrome

摘要

In the present paper we present a rare variation in the origin of the first lumbrical muscle of the hand. During the dissection classes in the Department of Anatomy at Kasturba Medical College, a 56 years old female cadaver showed the origin of first lumbrical muscle from the tendons of flexor digitorum profundus and its accessory belly. Its proximal extent was upto the proximal border of flexor retinaculum. Due to this unusual origin of lumbrical, median nerve may be compressed. The clinical significance of the variation is discussed. Case report During the gross anatomy dissection of a 56 year old female cadaver, we observed that the flexor digitorum profundus (FDP) tendon on the right side for the middle finger had an accessory belly arising from the undersurface of the flexor digitorum superficialis(FDS). The origin of the first lumbrical was seen arising both from the FDP tendon and the tendon of the accessory belly. Its proximal extent was up to the proximal border of the flexor retinaculum (figure -1).