THE BRAIX 



093 



and small intestine. It is inhibitory to the heart, and secretory to the 

 glands of the stomach, and possibly of the pancreas. 



The Ninth Nerve, or Olosso-Pharyngeal Nerve, is essentially an 

 afferent nerve, the cell-stations of its fibres being the jugular and 

 petrosal ganglia. The ingoing branches from the ganglia branch, 

 on entering the medulla, passing slightly upwards to the cells 

 constituting the ninth nucleus, and downwards in the fasciculus 



Cord 



Post. 



FIG. 421. DIAGRAM TO ILLUSTRATE THE 

 POSITION OF THE BULBAR NUCLEI OF 

 THE CRANIAL NERVES. 



Posterior aspect of the fourth ventricle 

 exposed by removal of the pons and 

 cerebellum. Motor nuclei indicated 

 by horizontal lines, sensory nuclei by 

 dots. Median group of motor nuclei, 

 ///, IV, VI, XII. Lateral group of 

 motor nuclei, Vm, VII. X, XI. Sen- 

 sory nuclei, Vs, VIII, IX. ' 



Fiu. 422. LATERAL VIEW OF THE RIGHT 

 HALF OF THE BULB AND PONS EXPOSED 

 BY A VERTICAL SECTION, AND IMAGINED 

 AS TRANSPARENT. (After Erb.) 



In this view the lateral group of motor 

 nuclei, Vm, VII, X, XI, lio farther 

 from the surface of section, and are 

 indicated by lighter lines than the 

 median group of motor nuclei, ///, 

 IV, VI, XII. 



solitarius. The afferent fibres are concerned with the sensation of 

 taste in the posterior third of the tongue, and with common sensation 

 of this region and of the upper part of the pharynx. In the nerve 

 also run some effector fibres. These arise mainly from the xipward 

 continuation of the nucleus ambiguus, and supply the constrictor 

 muscles of the pharynx, the stylo-pharyngeus, and levator palati 

 muscles. The nerve also contains effector secretory fibres to the 

 parotid gland, the cell-stations of which are not exactly known. 

 These pursue a somewhat devious course to reach the gland (see p. 374). 



