SECTIOI^ OF 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 5, and marked 16, 16. 

 If the position of g, g in fig. 3, plate viii., and h 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 of 

 the brain ; and the prolongation of it, which bears the name 

 of the cms 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. 

 h. The cunieform, or wedge-shaped process, or base of the 

 occipital-bone. Between it and the other portion of the occi- 

 pital-bone, «, lies the great foramen or aperture through which 

 the prolongation of that portion of the brain called the 

 spinal-marrow issues from the cranium, sjid is continued 

 through the spine or back-bone. 



