58 BASE OF THE SKULL. 



which supports the medulla oblongata and pons Varolii, and on each 

 side the following foramina from before backwards. The interned 

 auditory foramen^ for the auditory and facial nerve and auditory 

 artery ; behind, and external to this is a small foramen leading into 



Fig. 30.* 



the aquceductus vestibuli ; and below it, partly concealed by the edge of 

 the petrous bone, the aquxductzis cocldett ; next, a long fissure, the 

 foramen lacerum posterius, or jugular foramen, giving passage ex- 



* The external or basilar surface of the base of the skull. 1,1. The hard 

 palate. The figures are placed upon the palate processes of the superior max- 

 illary bones. 2. The incisive, or anterior palatine foramen. 3. The palate 

 process of the palate bone. The large opening near the figure is the posterior 

 palatine foramen. 4. The palate spine ; the curved line upon which the num- 

 ber rests, is the transverse ridge. 5. The vomer, dividing the openings of the 

 posterior nares. 6. The internal pterygoid plate. 7- The scaphoid fossa. 8. 

 The external pterygoid plate. The interval between 6 and 8 (right side of the 

 figure), is the pterygoid fossa. 9- The zygomatic fossa. 10. The basilar pro- 

 cess of the occipital bone. 11. The foramen magnum. 12. The foramen 

 ovale. 13. The foramen spinosum. 14. The glenoid fossa. 15. The meatus 

 auditorius externus. 16. The foramen lacerum anterius basis cranii. 17. The 

 carotid foramen of the left side. 18. The foramen lacerum posterius, or jugu- 

 lar foramen. 19- The styloid process. 20. The stylo-mastoid foramen. 21. 

 The mastoid process. 22*. One of the condyles of the occipital bone. 23. The 

 posterior condyloid fossa. 



