THE FLEXOR POLLICIS LONGUS AND ITS RELATION TO THE ANTERIOR AND POSTERIOR INTEROSSEOUS NERVES

Sixty paired cadaver upper extremities were dissected to study the ana tomy of the flexor pollicis longus in the forearm and its relation to the median and anterior interosseous nerves. rin accessory head was no ted in 33 (55%) of 60 specimens. The accessory head was noted to pass anterior to the anterior interosseous nerve in all specimens, The acce ssory head was noted to pass posterior to the median nerve in 57 speci mens, and anterior to the nerve in three. Tendon or muscle anomalies w ere noted in eight specimens (13%), seven of which involved an anomalo us attachment between the FPL and the flexor digitorum profundus of th e index.