Page 811 - My FlipBook

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PRINCIPLES OF FACIAL ORTHOPEDIA. 809

lines which arise at a point below the ridge of the nose and curve down-
ward to inclose the aloe and depressions on eitiier side ; tiience laterally
to encircle a portion of the cheek, and downward to inclose the entire
chin. (See Fig. 845.)
Within this ovoidal area are the main features of expression.
Within this space the slightest change of
Fig. 84o.
contour will often produce a marked eifect
upon the entire physiognomy and give a
diiferent expression to the countenance.
It is here that an inherited or an acquired
lack of symmetry in the size, shape, or
position of the teeth and jaws produces
those marked changes of facial contour
which characterize different physiogno-
mies. This area may be termed the
" changeable area " in contradistinction to
the more stable features, or " unchangeable
area."
For convenience of ready reference,
the features in that portion of the change-
able area which are bounded laterally by
the naso-labial lines may be divided into four segments as follows
Segment 1.—The end of the nose and the upper portion of the upper
lip, including the naso-labial depressions.
Fig. 846.

Unchangeable area
.

Changeable area -

Segment 2.—The lower portion of the upper lip.
Segment 3.—The lower lip.
Segment 4-—The chin.