6 DISSECTION OF THE CAT 



jugular foramen. -From the anterior part of the 

 temporal bone extends a bony arch, the zygomal it- 

 process. On the under side of this process is a 

 depression for the articulation of the lower jaw, 

 called the glenoid fossa. 



3. The Parietal Bones, which form the upper pos- 

 terior part of the skull. They meet, above, in the 

 median line. 



4. The Interparietal Bone, which lies in the mid- 

 dorsal line, between the parietal and occipital 

 bones. It is small and triangular. 



5. The Sphenoid Bone, which partially forms the 

 base of the skull. It lies in front of the occip- 

 ital and between the temporal bones. The sphe- 

 noid is pierced on either side by two foramina, the 

 posterior of which is the foramen ovale, the ante- 

 rior the foramen rotundum. 



6. The Presphenoid Bone, which lies in the mid- 

 ventral line, immediately in front of the sphe- 

 noid. It is pierced on either side by the optic 

 foramina. Between the sphenoid and presphe- 

 noid bones, in line with the optic foramen and the 

 foramen rotundum, is the large sphenoidal fissure. 



7. The Frontal Bones, which form the anterior 

 part of the roof of the skull, meeting above in the 

 mid-line. On either side each frontal bone presents 

 a sharp process, the post-orbital. The cavity be- 

 hind this process is the temporal fossa. 



8. The Malar Bones, which form the outer infe- 

 rior margin of the orbits. Each articulates pos- 



