= ae 
THE SKULL IN SECTION. 
163 
Fic. 117.—BASE OF THE SKULL AS SEEN FROM ABOVE. 
1. Frontal bone. 
. 2. Slit for nasal nerve. 
3. Anterior ethmoidal foramen. 
4, Posterior ethmoidal foramen. 
5. Optic foramen. 
6. Foramen for internal carotid artery formed by 
anterior and middle clinoid processes. 
7. Lesser wing of sphenoid. 
8. Anterior clinoid process, in this case united on 
its inner side to the middle clinoid process. 
9. Posterior clinoid process. 
10. Foramen ovale. 
11. Groove for middle meningeal artery. 
12. Foramen spinosum. 
13. Hiatus Fallopii. 
14. Line of petro-squamosal suture. 
15. Internal auditory meatus. 
16. Groove for superior petrosal sinus. 
17. Groove for sigmoid part of lateral sinus. 
18. Jugular foramen. 
19. Anterior condylic foramen. 
20. Groove for lateral sinus. 
21. Internal occipital protuberance. 
22. Ridge for attachment of falx cerebri. 
23. Fossa for the lodgment of the occipital lobes of 
cerebrum. 
24, Ridge for the attachment of the falx cerebelli. 
25. Fossa for the lodgment of the left cerebellar 
hemisphere. 
26. Foramen magnum. 
27. Groove for the sigmoid sinus turning into the 
jugular foramen. 
28. Groove for the inferior petrosal sinus running 
along the line of suture between the petrous 
temporal and the basioccipital. 
29. Depression for the Gasserian ganglion. 
30. Middle cranial fossa for lodgment of temporal 
lobe of cerebrum. 
31. Foramen lacerum medium. 
32. Carotid groove. 
33. Dorsum selle of sphenoid. 
34, Leads into foramen rotundum. 
35. Pituitary fossa. 
36. Olivary eminence of sphenoid. 
87. Anterior cranial fossa for lodgment of frontal lobes 
of cerebrum. 
38. Cribriform plate of ethmoid. 
39. Crista galli of ethmoid. 
40. Foramen cecum. 
41. Crest for attachment of falx cerebri. 
