The skin over the exterior parts
of both eyebrows is at the same time drawn downwards and smooth,
by the contraction of the outer portions of the orbicular muscles.
The eyebrows are likewise brought together through the simultaneous
contraction of the corrugators;[3] and this latter action generates
vertical furrows, separating the exterior and lowered part of the skin
of the forehead from the central and raised part. The union of these
vertical furrows with the central and transverse furrows (see figs.
2 and 3) produces a mark on the forehead which has been compared
to a horse-shoe; but the furrows more strictly form three sides
of a quadrangle. They are often conspicuous on the foreheads of adult
or nearly adult persons, when their eyebrows are made oblique;
but with young children, owing to their skin not easily wrinkling,
they are rarely seen, or mere traces of them can be detected.
These peculiar furrows are best represented in fig. 3, Plate II.,
on the forehead of a young lady who has the power in an unusual
degree of voluntarily acting on the requisite muscles.
As she was absorbed in the attempt, whilst being photographed,
her expression was not at all one of grief; I have therefore
given the forehead alone.
Pages:
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269