After a brief report of median nerve anatomy at wrist, authors describ
e terminal variations of its distribution. Classic description of five
terminal sensitive and motor median nerve branches is not constant. M
any anatomic variations have been reported and so many, classification
s proposed. Lantz'classification is useful, it may be divided in four
groups. Other anatomic variations concern cutaneous palmar nerve branc
h and different nervous anastomosis. Advantage of this anatomic study
is incidence of variations on surgical access of carpal tunnel. Those
nervous variations of median nerve at wrist are frequent, unknown and
wrong indexed and may be so many << anatomic traps >> for surgeon.