270 LABORATORY MANUAL OF HUMAN ANATOMY 



(b) External ramus (ramus externus) (0. T. spinal portion). Follow it 

 to the sternocleidomastoid muscle. Its peripheral distribution has 

 been studied in the neck. 



Vagus Nerve (N. vagus) (O. T. Pneumogastric Nerve). (Vide 



Fig. 92.) 



Study the two ganglia from the cells of which its constituent 

 sensory fibres arise : 



(a) Upper or jugular ganglion (ganglion jugulare) (0. T. ganglion of 



the root). 



(b) Lower or knotty ganglion (ganglion nodosum) (0. T. ganglion of the 



trunk). 



In special dissections from the museum, with the aid of 

 models and atlases, study the following : 



(a) Meningeal ramus (ramus meningeus) (0. T. recurrent branch). 



(b) Auricular ramus (ramus auricularis) (0. T. Arnold's nerve). 



(c) Anastomotic ramus with glossopharyngeal nerve (ramus anastomoti- 



cus cum N. glossopharyngeo). 



The following branches, already examined in the dissection 

 of the side of the neck, may be conveniently reviewed : 



(a) Pharyngeal rami (rami pharyngei). 



(b) Superior laryngeal nerve (N. laryngeus superior}. 



(ba) External ramus (ramus externus). 



(bb) Internal ramus (ramus internus). 



(be) Ramus anastomosing with. inferior laryngeal nerve (ramus 

 anastomoticus cum N. laryngeo inferiori). 



(c) Superior cardiac rami (rami cardiaci superior es}. 



(d) Depressor nerve (N. depressor). 



(e) Recurrent nerve (N. recurrens) (0. T. recurrent laryngeal). 



The other branches are studied when the thorax and abdomen 

 are dissected. 



Glossopharyngeal Nerve (N. glossopharyngeus). (Vide Fig. 112.) 



Examine its relations in the jugular foramen. Find the two 

 ganglia which give origin to those of its fibres that are sensory : 



(a) Upper ganglion (ganglion superius) (0. T. jugular ganglion). 



(b) Lower or petrous ganglion (ganglion petrosum) (0. T. ganglion of 



Andersch). 



Find as many of the branches of the N. glossopharyngeus in 

 your own dissection as you can and supplement the study of the 



