Fig. 3. Results of the cutting tests on nail clippings (A) giving the mean
toughness (± S.D., N=15) of central and outer
sections of the nail, when cut in the longitudinal and transverse directions
and (B) showing the mean toughness (± S.D., N=10)
of each of the three layers of the fingernail, when cut in the longitudinal
and transverse directions.