518 NEUROLOGY. 



2. The fasciculi joining the primitive carotid leave the inferior 

 part of the ganglion in numerous branches, united by communi- 

 cating filaments ; at the division of the artery they communicate 

 with branches from the glosso-pharyngeal and pneumogastric, 

 forming the carotid iilexus, the ramifications of which are almost 

 exclusively distributed to the external carotid artery and salivary 

 glands, one twig being sent to the otic gangliou. 



3. The guttural or pharyngeal are very delicate branches, which 

 leave the anterior border of the ganglion, and, gaining the 

 superior walls of the pharynx, communicate with filaments from 

 the glosso-pharyngeal and pneumogastric nerves to form the 

 pharyngeal plexus. 



The intermediate cord of the cervical yanglia leaves the 

 mferior part of the ganglion, and passes down the neck in com- 

 pany with the par vagum to the entrance of the thorax, where 

 it joins the inferior ganglion. 



The Inferior Cervical ganglion, larger than the superior, 

 is placed on the inner side of the costal insertion of the scalenus 

 muscle, and against the trachea, the right ganglion being always 

 a little in advance of the left, which is separated from the trachea 

 by the oesophagus. The form of this ganglion is variable and 

 irregular, sometimes being lenticular and sometimes elongated, 

 but always more or less radiated. Occasionally it is double ; in 

 this case, which occurs more generally in the right than in the 

 left ganglion, the two portions are distinguished as anterior and 

 posterior ; the former, which is the smaller, being the oniddle 

 cervical ganglion of the human anatomist, the two being joined 

 by a short band of grey matter. 



This ganglion receives two branches from the cervical nerves, 

 one being formed by filaments which emanate from the second 

 to the seventh pairs, inclusive, the other being a single branch 

 from the eighth. In addition to these, several filaments are 

 transmitted to it from the pneumogastric. 



The emergent branches, detached from the inferior and poste- 

 rior parts of the ganglion, chiefly supply the heart, some filaments 

 being sent to the anterior mediastinum and the arteries of the 

 brachial trunk. 



The Cardiac nerves are five in number, three coming from 

 the left and two from the right cervical ganglion ; these, assisted 

 by branches from the vagus, form the cardiac plexus, some 

 branches from which accompany the aorta, and are distributed 



