THE DEEP CONNEXIONS OF THE CEEEBKAL NEEVES. 597 



;he medial lemniscus, and upwards as high as the place of entrance of the 

 jochlear root of the acoustic nerve. From its dorsal aspect the axons of the cells 

 proceed, and in the first instance they pass backwards towards the floor of the 

 ourth ventricle; then, bending suddenly laterally and forwards, they join the 

 ifferent roots of the vagus and the glossopharyngeal nerves, and emerge from the 

 Drain in company with these. 



Sensory or Terminal Nuclei of the Glossopharyngeal and Vagus. 

 Splanchnic and Gustatory Components. The cells in the portion of the dorsal 

 lucleus which acts as a nucleus of termination are spindle-shaped in form and 



Lemniscus 



Mesencephalic root 

 of triqeminus 



Motor root 

 of tricjeminus 



Nucleus vestibul 

 superior 



Nucleus vestibuli 

 lateralis 



N.vestibula 



N. facial! 

 Glossopharyngeal n. ^ 



Nucleus vestibuli' 

 medialis 

 Vagus 



Va 



FIG. 530. DIAGRAM, showing the brain connexions of the vagus, glossopharyngeal, acoustic, 

 facial, abducens, and trigeminal nerves. 



iimilar to those found in the posterior column of gray matter in the spinal medulla. 

 [n connexion with these cells, the greater number of the afferent fibres of the 

 > r agus nerve, and a small proportion of the afferent fibres of the glossopharyngeal 

 icrve, end in fine terminal arborisations. A small part of the superior portion of 

 ;he nucleus may be said to belong to the glossopharyngeal nerve and the remainder 

 )f the nucleus to the vagus nerve. 



The tractus solitarius (Figs. 494, p. 561; 495, p. 561; and 530) is a round 

 3undle of longitudinal fibres which forms a very conspicuous object in trans- 

 verse sections through the medulla oblongata. It begins at the superior limit 

 rf the medulla oblongata, and can be traced downwards through its whole 

 length. Its precise point of termination is not known, but some authorities believe 



