524 



THE BRAIN 



spinales laterales of opposite sides which produces this char 

 acteristic decussation. 



But if the fasciculus cerebrospinalis anterior of the anterior funiculus of 

 the spinal medulla is alone represented in the corresponding district of the 

 medulla oblongata, it may be asked : What becomes of the larger lateral part 

 of the anterior funiculus of the spinal medulla in the medulla oblongata ? It 

 is thrust aside by the decussating bundles of the fasciculus cerebrospinalis 

 lateralis, and thus comes to occupy a deep position in the medulla oblongata. 



Optic tract 



Pedunculus cerebri 



Corpus geniculatum laterale 



Pulvinar 



Corpus geniculatum mediale 



Superior brachium 

 Inferior brachium 

 Inferior quadrigemmal body 

 Lateral lemniscus 

 Brachium conjunctivum 

 Tsenia pontis 



j" Brachium pontis 



Restiform body 



Ligula 



Olive 



Arcuate fibres 

 -Clava 



~~~Funiculus cuneatus 

 ~"~Rolandic tubercle 

 "~ ~- Lateral district of medulla oblongata 



Anterior funiculus of spinal medulla 



FIG. 221. Lateral view of the Medulla Oblongata, Pons, and 

 Mesencephalon of a full-time Foetus. 



Lateral Area of the Medulla Oblongata. This is the 

 district on the surface of the medulla oblongata which is 

 included between the two rows of nerve fila, viz., the hypo- 

 glossal fila anteriorly, and the fila of the accessory, vagus, and 

 glosso-pharyngeal posteriorly. It presents a very different 

 appearance in its upper and lower parts. In its lower 

 portion it appears to the eye as a continuation upwards 

 of the lateral funiculus of the spinal medulla ; in its upper 

 part is seen the striking oval prominence named the olive. 



The lower part of this district, however, is very far from 



