Forty cadaver hands (160 fingers) were dissected to study the morpholo
gy and variations of the chiasma of the flexor digitorum superficialis
tendon. Ten types of chiasma were noted, One chiasma did not fit into
any of the patterns. The long and ring fingers had a very similar dis
tribution of types of chiasma but the index and small both had differe
nt patterns. The length of chiasma showed a marked variability which a
ppeared to be independent of phalangeal length.