€8 



THE HORSE. 



Thev communicate with the cavities of the nose, and likewise with those 

 o the spT^^oid, ethmoid, and upper jaw bones, and hke tl- wnidings of a 

 French horn, increase the clearness and loudness of the neighmg. They 

 are sufficiently evident at h in the following cut. 



SECTION OF THE HEAD. 



The nasal bone, or bone of the nose. 



Tlie frontal bone. The cavities or cells beneath are called the frontal sinnses. 



The crest or ridge of the parietal bones. 



The tentorium, or bony separation between the cerebrum and cerebellum. 



The occipital bone. 



The ligament of the neck, or pack-wax, by which the head is chiefly supported. 



The atlas, sustaining or carrying, or first bone of the neck. 



The dentata, tooth-like, or second bone of the neck. 



The cuneiform, or wedge-shaped process, or base of the occipital bone. Between it and 

 the other portion of the occipital bone e, lies the great foramen or aperture through 

 which the prolongation of the brain,— the spinal marrow,_issues from the skull. 



The sphenoid, wedge-like, bone with its cavities. 



The ethmoid, sieve-like bone with its cells. 



The cerebrum, or brain, with the appearance of its cortical and medullary substance. 



The cerebellum, or little brain, with its beautiful arborescent appearance. 



A portion of the central medullary, marrow-like, swh^isincQ of the brain, and the prolon- 

 gation of it under the name of the crus cerebri, leg of the brain, and from which 

 many of the nerves take their origin. 



Tlie medulla oblongata^— the prolongation of the brain after the medullary substance of 

 the cerebrum jwid cerebeUuni have united, aud forming the comoflencement of the 



