ANATOMY OF TPIE HORSE. 
189 
occupied by the superior turbinated bone ; the unoccupied part • 
constituting the upper nasal meatus. Posteriorly, between the 
two bones a sinus is formed, which, though sometimes called 
the nasal, proves to be nothing more than the anterior chamber 
of the frontal, the two uniting into one cavity. ‘ 
Borders. The Superior is straight; but its edge is turned 
inward, forming a sort of internal crest, which along with its 
fellow is embraced by the superior border of the cartilaginous 
septum of the nose. Along their superior borders the two nasal 
bones are united—in the young subject by a sort of mortise- 
connection ; in the adult, by a suture half denticulated and half 
- plain or smooth-edged.— The Inferior Border is waving, and is. 
denticulated and mortised in its articulation with the superior 
and anterior maxillary bones; it is,united also by denticulation 
with the lachrymal. 
The Base has its border broadly sloped off and denticulated, 
and is united with the frontal bone, lying upon its anterior 
border. 
Ilie Apices of the two bones form together the nasal peak ; a 
perfectly insulated or unconnected and remarkable projection, 
which gives support to the nostrils and has attached to it the 
dilatator narium anterior. 
Connection, With the frontal, superior and anterior maxillary, 
and lachrymal bones : the two together maintain, superiorly, in 
its place, the septum nasi. 
SUPERIOR MAXILLARY BONES. (oSSA MAXILLARIA 
SUPERIORA.) 
Situation, Supero-lateral parts of the face. 
Figure —Trilateral: thick in the middle ; posterior part, gib¬ 
bous ; anterior, thin, tapering and lamir/ous. 
Division —Into three surfaces, two extremities, and three bor¬ 
ders. 
The Fxternal or Facial Surface is partially subdivided into 
antero-superior and postero-inferior portions by a protuberant 
ridge named the superior maxillary spine, which forms one 
continuous line with the zygomatic spine and ends abruptly op¬ 
posite to the third molar tooth : the upper subdivision is much 
the larger and affords attachment to the masseter. Rather 
above the middle of the upper surface opens the infra-orbital 
foramen, traversed by bloodvessels and nerves bearing the same 
name. 
The Inferior or Falatine Surface exhibits the concave side of 
a vaulted, demi-arched, oblong plate, called the palatine process 
