SUPERIOR REGION OF THE SKULL. 



55 



occipital bone and occipital protuberance. It is crossed transversely 

 by the coronal suture, and marked from before backwards by the 

 sagittal, which terminates posteriorly in the lambdoid suture. Near 



Fig. 29.* 



the posterior extremity of the region, and on each side of the sagittal 

 suture, is the parietal foramen. 



Upon the inner, or cerebral surface of this region is a shallow 

 groove, extending along the middle line from before backwards, for 

 the superior longitudinal sinus ; on either side of this groove are 



* The cerebral surface of the base of the skull. 1 . One side of the anterior 

 fossa ; the number is placed on the roof of the orbit, formed by the orbital 

 plate of the frontal bone. 2. The lesser wing of the sphenoid. 3. The crista 

 galli. 4. The foramen csecum. 5. The cribriform lamella of the ethmoid. 6. 

 The processus olivaris. 7- The foramen opticum. 8. The anterior clinoid 

 process. 9. The carotid groove upon the side of the sella turcica, for the in- 

 ternal carotid artery and cavernous sinus. 10, 11, 12. The middle fossa of 

 the base of the skull. 10. Marks the great ala of the sphenoid. 11. The 

 squamous portion of the temporal bone. 12. The petrous portion of the tem- 

 poral. 13. The sella turcica. 14. The basilar portion of the sphenoid and 

 occipital bone (clivus Blumenbachii). The uneven ridge between Nos. 13, 14, 

 is the dorsum ephippii, and the prominent angles of this process the posterior 

 clinoid processes. 15 The foramen rotundum. 1 6. The foramen ovale. 17. 

 The foramen spinosum ; the small irregular opening between 1 7 and 1 2 is the 

 hiatus Fallopii. 18. The posterior fossa of the base of the skull. 19, 19. The 

 groove for the lateral sinus. 20. The ridge upon the occipital bone, which gives 

 attachment to the falx cerebelli. 21. The foramen magnum. 22. The meatus 

 auditorius internus. 23. The jugular foramen. 



