The topography of the intraneural fascicular groups must be understood
if the treatment of acute lacerations of the major nerves in the forearm is
to be successful. Most lacerations in the upper extremity occur at the
wrist and in the distal half of the forearm. With microsurgical
longitudinal dissections and serial sections, we studied the intraneural
topography of the fascicular groups of the median and ulnar nerves
utilizing forty-five fresh frozen or refrigerated specimens. We devised a
new technique of light photography to demonstrate the distinct boundaries
of the fascicular groups. The intraneural fascicular groups provide the
anatomical basis for the recommended surgical techniques of group
fascicular repair and nerve-grafting.