1 8 . EQUINE ANATOMY. 



The external auditory meatus, a round opening leading into the 

 auditory canal. 



The mastoid process, a round eminence behind the preceding, 

 hollowed out with cells, communicating with the middle ear. 



The stylo-mastoid, in front of the preceding. 



Below, the styloid process for the origin of the Tensor Palati 

 and Eustachian tube. 



The hyoid or vaginal process, a small elevation. 



Articulations 7. 



Occipital, parietal, frontal, sphenoid, zygoma, superior maxilla 

 and inferior maxilla. 



THE FACE. 



This consists of 16 bones, viz., two superior maxillary, two in- 

 ter-maxillary, two palate, two zygomas, two lachrymals, two nasals, 

 two inferior turbinated, one vomer and one inferior maxillary. 

 The pterygoid bones are considered parts of the sphenoid, the 

 superior turbinated parts of the ethmoid, and the hyoid not as 

 belonging to the face. 



THE SUPERIOR MAXILLA. 



These two large bones form the greater part of the structure of 

 the face, and are wedged in between the frontal, nasal zygomas, 

 palates, lachrymal and vomer. 



It is divided into two faces, two borders, and two extremities. 



The External Face shows 



A convex surface ending below in the super-maxillary spine, a 

 long ridge continuous with the zygoma. 



The orifice of the intra-orbital canal. 



The Internal Face shows 



The flat surface, forming the outer wall of the nasal fossa. 



A deep excavation, the maxillary sinus. 



A fissure which forms the palatine canal. 



A ridge for the inferior turbinated. 



The inferior opening of the lachrymal canal. 



The palatine process, uniting with the opposite, forming the 

 floor of the nasal fossa. 



Anterior border shows 



