74 



THE SKELETON OF THE HORSE 



external acoustic process projects outward through a deep notch in the ventral 

 margin of the squamous temporal below the temporal crest. A little further back 

 is the mastoid process, crossed in its upper part by a groove for the posterior 

 meningeal artery. 



The orbital region comprises the orbit and the pterygo-palatine fossa. The 



Nuchal crest 



Occipital 

 Interparietal 



Parietal 

 Squamous temporal 



Frontal 



Parietal crest 



Temporal fossa 

 Temporal crext 



^: Coronoid process 

 Zygomatic arch 



Supraorbital process 

 Supraorbital foramen 



Orbit 

 Facial crest 



I nfriiDrbilal foramen 



Nasal process of preninxilla 



Body of premaiillii 



Foramen incisivum 



Fig. 47. — Skull of Horse; Dorsal View. 

 1, Parieto-occipital suture; 2, squamous suture; 3, parietal suture; 4, parieto-frontal suture; 5, frontal suture; 

 6, naso-frontal suture; 7, naso-lacrimal suture; 8, lacrirao-malar suture; 9, lacrimo-maxillary suture; 10, maxillo- 

 malar suture; 11, naso-maxillary suture; 12, nasal suture. 



orbit is a cavity which incloses the eyeball, with the muscles, vessels, and nerves 

 associated with it. It is not separated in the skeleton from the temporal fossa. 

 The axis of the orbit (Axis orbitae), taken from the optic foramen to the middle of 

 the inlet, is directed forward, outward, and slightly upward. The medial wall 

 (Paries medialis) is complete and extensive. It is concave and smooth, and is 

 formed by the frontal and lacrimal and the orbital wing of the sphenoid. In its 



