478 



THE BRAIN 



take up a position in the opposite lateral funiculus of the 

 spinal medulla, close to the posterior column of grey matter. 

 It is the intercrossing of the corresponding bundles of the 

 lateral cerebro-spinal fasciculi of opposite sides which pro- 

 duces the characteristic decussation. 



But whilst the fasciculus cerebrospinalis anterior of the 

 anterior funiculus and the fasciculus cerebrospinalis lateralis 

 of the opposite lateral funiculus of the spinal medulla are 



Optic tract 



Pedunculus cerebri 



orpus geniculatum laterale 



Pulvinar 



Corpus geniculatum mediale 

 Superior brachium 

 Inferior brachium 

 Inferior quadrigeminal body 

 Lateral lemniscus 

 Brachium conjunctivum 

 Taenia pontis 



Brachium pontis 



Restiform body 



Ligula 



~~~ Olive 



Arcuate fibres 

 Clava 



Funiculus cuneatus 



Tuberculum cinereum 



Lateral district of medulla oblongata 



Anterior funiculus of spinal medulla 



FIG. 194. Lateral view of the Medulla Oblongata, Pons, 

 and Mesencephalon of a full-time Fcetus. 



both represented in one 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 backwards by the 

 decussating bundles of the lateral cerebro-spinal fasciculus, 

 and occupies a deep position in the medulla oblongata. 



Lateral Area of the Medulla Oblongata. The lateral area 

 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 



