SECTION OP THE INTERNAL ANATOMY OF THE HEAD. 195 
nostrils were glandered. An opening is made into these 
sinuses, which may be effected with perfect safety. Suppose 
a line to be drawn across the forehead from 2 and 3, one 
foramen to the other, plate viii. fig. g, g, g. On that line, 
and about half an inch from the suture, or line which 
separates the frontal bones, the sinuses or cavities are situ¬ 
ated, and extend to an inch in depth, as represented in 
plate iii., fig. 3, immediately under b, and marked 16, 16. 
If the position of g, g in fig. 3, plate viii., and b in fig. 3, 
plate iii., are compared, a perfect idea of their seat in the 
forehead will be formed. At this part a small perforation 
is made, into this warm water is injected by means of 
a common squirt, which will run out at the nostrils. If 
there be matter either in the sinuses or nostrils, it will be 
found mixed with the water. If it presents the appearance 
mentioned at page 19 and sinks, then it is certain the 
animal is glandered. 
c. The nasal bone, or bone of the nose. 
d. The tentorium, or bony separation between the cerebrum 
and cerebellum. 
e. The occipital bone. 
f. The cerebrum, or brain. 
g . The cerebellum, or little bram. 
h A portion of the medullary, or marrow-like substance ot 
the brain ; and the prolongation of it, which bears the name 
of the crus cerebri , or leg of the brain, and from which 
many of the nerves emanate. 
i, and m. The ligament of the neck, or pack-wax, by which the head 
is chiefly supported. 
j. The sphenoid, or wedge-like bone, with its cavities. 
k. The cunieform, or wedge-shaped process, or base of the 
occipital-bone. Between it and the other portion of the occi¬ 
pital-bone, a, lies the great foramen or aperture through which 
the prolongation of that portion of the brain called the 
spinal-marrow issues from the cranium, and is continued 
through the spine or back-bone. 
