1268 



HUMAN ANATOMY. 



The communications of this ganghon include filaments which pass between the ganglion 

 nnd (a) the facial and (d) spinal accessory nerves, {c) the superior cervical ganglion of the 

 sympathetic nerve and {d) the petrous ganglion of the glosso-pharyngeal. 



The ganglion of the trunk (g. nodosum) or lower ganglion (Fig. 1077) 

 is a reddish, flattened, fusiform group of nerve-cells. It lies beneath the jugular 

 foramen, about i cm. below the ganglion of the root, and measures from 1.5-2 cm. 

 in length and about 4 mrti. in diameter. The accessory part of the spinal accessory 

 nerve passes o\^er the ganglion on its way to fuse with the vagus, which it does 

 usually immediately beyond the ganglion. 



The communications of this ganglion include filaments which pass between the ganglion 

 and {a) the hypoglossal and {d) spinal accessory nerves, (c) the loop between the first and 

 second cervical nerves and {d) the superior cervical ganglion of the sympathetic. 



Branches. — The vagus nerve gives ofT the following branches: from the 

 ganglion of the root, (i) the menmgeal and (2) the aiiriadar ; from the ganglion 



Fig. 1078. 



ICERV.N 



HCERV. N 



PHARYNGEAt, 

 PLEXUS 



Diagram of upper part of right vagus nerve, showing its pharyngeal and laryngeal branches with connections. 



of the trunk, (3) ^& pharyngeal and (4) the siiperior laryngeal ; in the neck, (5) 

 the superior cervical cardiac, and ('6) the inferior cervical cardiac ; in the thorax, 

 (7) the iyiferior laryngeal, (8) the thoracic cardiac, (9) the a?iterior pulmonary , 

 (10) the posterior pulmonary, (11) the oesophageal and (12) \.\\q pericardial ; and 

 in the abdomen, (13) the abdominal. 



1. The meningeal branch (r. meningeus) arises from the ganglion of the 

 root and follows a recurrent course upward through the jugular foramen to supply 

 the dura mater of the posterior fossa of the cranium, especially in the vicinity of the 

 lateral and occipital sinuses. 



2. The auricular branch (r. attricularis) is given off from the ganglion 

 of the root. It receives a filament of communication from the petrous ganglion 

 of the ninth nerve and follows the outer margin of the jugular foramen to an 

 opening between the stylo-mastoid and jugular foramina. Entering this foramen it 

 traverses a canal in the temporal bone w^hich crosses the inner side of the facial canal 

 and terminates between the mastoid process and the external auditory meatus. 



