parotid region ; its fibres are thin, or may be absent,
and lie quite close to the surface. It is easiest dis-
sected by beginning at the angle of the mouth, and
tracing it outwards. The angle of the mouth should
be drawn towards the opposite side with hooks, to
facilitate the dissection. l?he muscles below the
mouth may now be dissected. Beginning at the angle
of the mouth, the fibres of the depressor anguli oris
should be traced down, until it is seen to be con-
tinuous with the platysma myoides. Partially con-
cealed by the depressor anguli oris, and beneath its
anterior border, the fairly broad depressor labii
inferioris should be looked for. By carefully dissect-
ing round and round the mouth, the fibres of the
orbicularis oris should be completed, and it will be
seen that the fibres of the muscles already described
blend with it.
