480 



THE BRAIN 



side by the row of fila belonging to the accessory, vagus, and 

 glosso-pharyngeal nerves. 



The lower part of the posterior area corresponds more or 

 less closely with the posterior funiculus of the spinal medulla. 

 It will be remembered that in the cervical part of the spinal 

 medulla the posterior funiculus, on each side, is divided, by 

 a distinct septum of pia mater, into a postero-median strand, 

 the fasciculus gracilis, and a postero-lateral strand, the fasci- 

 culus cuneatus. The two strands are prolonged upwards into 



Pineal body 



Frenulum veli 



Anterior 

 medullary velum 



Brachium 

 conjunctivum 



Brachium pontis 



Striae medullares 



Area acustica 



Ala cinerea 



Funiculus cuneatus 



Funiculus gracilis 



Superior 

 quadrigeminal body 



Inferior 

 quadrigeminal body 



- Cerebral peduncle 



Pontine part of floor 



- of ventricle iv. 



Colliculus facialis 

 Area acustica 

 Restiform body 

 Trigonum hypoglossi 

 Clava 



Tuberculum 

 cinereum 



Funiculus cuneatus 



FIG. 195. Posterior view of the Medulla Oblongata, Pons, and Mesen- 

 cephalon of a full-time Foetus. The greater part of the roof of the 

 fourth ventricle is removed. 



the medulla oblongata. In the lower part of the posterior 

 area they stand out distinctly, and are separated from one 

 another by the postero-intermediate sulcus, which is continued 

 upwards from the medulla spinalis. Each strand, when 

 it reaches the lower part of the fourth ventricle, ends in a 

 slightly expanded prominence. The swollen extremity of the 

 fasciculus gracilis is called the dava ; it is thrust aside from 

 its fellow of the opposite side by the opening up of the 

 central canal to form the fourth ventricle. 



In sections at the level of the lower part of the fourth 



