( l°4) 
Thi OsM.-x- The Os Maxilla is a very irregular Bone. At the fore. part of 
jihe Super io- the Scull it begins with a lharp Point (/>./>.,) having that part of 
y,'* the Os frontis which forms part of the Oibit (d. Fig. *.) on the 
u one fide, and that part of the Os Palati ( m. ) which forms the 
Hole for the Root of the Trunk on the other 3 whence running 
6 Inches, and inclining inward by a crooked buture, it terminates 
in a Protuberance ; beneath which is a fmall Sinus afeending ob- 
liquely to the Hole for the Root of the Trunk ( n .) fram’d by 
the Blood Vefiels ('whereof above ) as they go to the nourilh- 
ment of the Trunk ; from thence it runs obliquely backward, and 
i' articulated with the i s Palati by a broad fquamous Sutyre. 
From the middle Protuberance of the Sinus for the Eye ( d.) it 
runs (freight- backward, being articulated with that part of the 
Os frontis which forms the aforefaid lower Edge of the Sinus for 
the Nervus Opticus ( s ) for the fpace of 18 Inches, where it be- 
gins to be overlaid with a Lamina of the Bone, which forms the 
upper and back-part ; whence it defeends 9 Inches, till it comes 
to tiie Root of the Teeth (».) where we fhall leave it, and re- 
turn to the fore-nam’d Protuberance • from whence having made 
up a part of the Sinus for the Globe of the Eye, as is faid, it runs 
backward 6 Inches, and is articulated (by a flat Suture ( g. ) 
which firfh defeends t Inch, then runs obliquely backward 2 i in- 
ches,) with th tOs Zygomaticum. At its beginning its 2 J Inches 
broad ; plain on its inner, and convex on its outer Surface ; bend- 
ed, as it defeends, like a Horn, and terminating in a Point. From 
the lower part of this Suture it becomes much thicker •, and ha- 
ving frtm’d a Sinus about 4 Inches long, it runs toward the fore- 
part of the Scull. From this Sinus, as it has returned 3 Inches, 
is form’d the fide of an Oval Hole, which running from before to 
behind is about ; * Inches long, and from the one fide to the 
other two Inches. At that fide which is fram’d by the Os Max- 
- Hit, and toward the Procejfus Zygomaticus , ’cis two Inches thick 3 
and at its other fide, it runs (freight backward from the Os Max - 
ilia, in a direct Line, with the great Cavity, which contains the 
Mufcles that move the Lower Jaw and Probofcit. This Hole is 
analogous to that in a Human Sceleton in the Os Maxilla , beneath 
the Orbit of the Eye; and is larger in Quadrupeds, being defti- 
- nated for tranfmiflion of a Vein, Artery, and thefuperior Branch 
of the fecond Divifion of the 5th Pair of Nerves, which in thofe 
go to the Upper Lip and Jaw ; but in this Subjed, as I have, al- 
ready fhe.wn at large, ’tis probable they ferve for the Nourifliment 
- m - and 
