36 ZOOTOMY. 



front of the auditory capsules, is a large oval space closed 

 by dense fibrous tissue; this is the posterior fontanelle. 



29. Anterior to and between the nasal capsules is a 

 similar space, freely open in the prepared skull, the 

 anterior fontanelle. 



30. In the side-wall of the skull, about midway between 

 the olfactory and auditory capsules, is the large optic 

 foramen for the transmission of the optic nerve (§ 183) : 

 almost immediately above this are several very minute 

 apertures through which the fourth nerve (§ 185) passes, 

 while behind it is a small foramen for the passage of the 

 third nerve (§ 184). 



31. The nasal capsule is perforated by two canals just 

 where it joins the skull, one through its upper part for the 

 orbito-nasal nerve (§ 205), another through its lower part 

 for the palato-nasal nerve (§ 209). 



32. By making a longitudinal vertical section of the 

 skull, or by removing its roof, the large olfactory 

 foramen is seen, leading from the cranial cavity into that 

 of the olfactory capsule, and giving exit to the olfactory 

 nerve (§ 179). 



33. In the same section of the skull is shown a large 

 foramen — the internal auditory meatus — leading from 

 the cranial cavity to that of the auditory capsule, and trans- 

 mitting the auditory nerve (§ 186) : a little posterior to this 

 is a small aperture by which the glossopharyngeal nerve 

 enters the auditory capsule to leave it by the foramen 

 already seen (§ 25, see also §§ 188 and 218): posterior to 

 this again is the inner aperture of the canal for the vagus 

 (§§24, 189, 219). 



VII. In the remaining loosely-attached portions of the 

 skull make out 



34. The labial cartilages (Fig. 10, //'. i — 4), of which 



