BONES OF THE CRANIUM 



119 



of irregular intercommunicating spaces, divided by bony septa, and communicat- 

 ing with the frontal sinus. In the polled breeds these processes are absent, the 

 skull is narrower in this region, and the frontal eminence more pronounced. The 

 supraorbital process is situated about half-way l^etween the anterior and posterior 

 margins; it is short and joins the frontal process of the malar bone. The supra- 

 orbital foramen (often double) is situated about an inch inward from the root of 

 the process; it is the external orifice of the supraorbital canal (Canalis supraorbi- 



Wing of atlas 



Squamous temporal bone 



Zygomatic arch 



Angle of jaw 



Malar bone 



Maxilla- 

 Facial tuber OS ill/ 

 Ramus of mandible 



External auditory 

 meatus 



Premaxilla 



Fig. 92. — Skull and Aii a- hi Ox, Ventral View. 

 13, Basi-occipital; 13", paramastoid or styloid proces.s; 13"', occipital condyle; 24', incisor teeth; S8, 

 body of mandible; 81, condyle of mandible; 32, ventral tubercle of atlas. (After Ellenberger-Baum, Anat. fiir 

 Kiinstler.) 



tahs), which passes downward and forward into the orbit. The foramen is in the 

 course of the supraorbital groove (Sulcus supraorbitalis), which marks the course 

 of the frontal vein. The anterior ends of the naso-frontal parts form a notch which 

 receives the nasal bones, and sutural or Wormian bones are often found at this 

 junction (naso-frontal suture). The orbital part is extensive; it is perforated 

 behind by the orbital opening of the supraorbital canal, and below by the ethmoidal 

 or internal orbital foramen. It does not articulate with the palatine, from which 

 it is separated by the orbital wing of the sphenoid. The temporal part is also more 



