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wedge cells. Its use is to form the back part of the palate, and part 
of the nose andorbit. Each bone is connected with its fellow, with 
the upper jaw, wedge, sieve, lower spongy, and plough-share bones, 
by harmony... 
‘THE PLOUGH-SHARE, 
Is situated in the middle cavity of the nostrils, which it divides into 
two parts. In shape it resembles a plough-share. ~ Its use, to sustain 
and divide the cavity of the nostrils. Above, it is united with the 
wedge bone, by being nailed, as it were, to it, and with the sieve bone, 
by harmony ; below, it is connected to the upper jaw and palate 
bones, by agreement, and is united to the cartilaginous division of 
the nose. So 
ao 
Is situated in the lower and front part of the face. _ its figure is 
like a horse shoe. There are two jointed processes which are receiv- 
re 
ed into the jointed cavities of the temple bones ; two. crow’s bill pro- . 
cesses, which are sharp pointed, and give adhesion to the temple 
muscles. The process in which the teeth are fixed; the union of 
the under jaw bones in the centre of the chin ; the lower edge, 
whose ends form the angles of the jaw. ‘a 
The cavities are, the half moon notch between each crow’s bill 
and jointed process; the hinder jaw holes, one above each angle, on 
the inner surface of the jaw, which transmit the lower jaw nerve and 
id nerve to the front jaw holes upon the external surface of 
nerve-a gain emerge upon the chin. 
Its use is to form a socket for the teeth ; to constitute the lower 
segment of the cavity of the mouth, and to afford a point of adhesion 
artery into a canal called the mental canal, which conducts the same _ 
§, one on each side of the chin, frou whence the artery and — 
bu Die 
ee ey ae o 
to the muscles ofthe throat, neck, and tongue. It is connected with _ 
the temple bones, by a hinge joint, with the teeth by enclosure, and | 
with the bone of the tongue and other parts, by muscles, 
_ PARTICULAR CAVITIES OF THE FACE, 
: The Orbits—Situated under the forehead, at the root of the nose. 
ow shape is halfof a hollow ball. The cavities are, a depression 
or the 
pression foi Ahe tear-bag; the nasal canal for the passage of the tears 
into the r ose ; an upper and lower orbital fissure; the eyebrow 
hole ; the lower orbital ca 
sight nerve. It is compos 
tear gland ; a notch of the orbital cartilaginous pulley ;.a de= — 
