SYMPATHETIC NEKVOTTS SYSTEM. 4:21 



It is situated on the submaxillary gland, is small, rounded, 

 and of a reddish-gray color. It receives motor filaments from 

 the chorda tympani, and sensory filaments from the lingual 

 branch of the fifth. Its filaments of distribution go to "Whar- 

 ton's duct, to the mucous membrane of the mouth, and to 

 the submaxillary gland. 



Cervical Ganglia. The three cervical ganglia are situ- 

 ated opposite the third, fifth, and the seventh cervical ver- 

 tebrae respectively. The middle ganglion is sometimes 

 wanting, and the inferior is occasionally fused with the first 

 thoracic ganglion. These ganglia are connected together 

 by the so-called sympathetic cord. They have numerous 

 filaments of communication above, with the cranial and the 

 cervical nerves of the cerebro-spinal system. Branches from 

 the superior ganglion go to the internal carotid, to form the 

 carotid and the cavernous plexus, following the vessels as 

 they branch to their distribution. Branches from this gan- 

 glion pass to the cranial ganglia. There are also branches 

 which unite with filaments from the pneumogastric and 

 the glosso-pharyngeal to form the pharyngeal plexus, and 

 branches which form a plexus on the external carotid, the 

 vertebral, and the thyroid artery, following the ramifications 

 of these vessels. 



From the cervical portion of the sympathetic, the three 

 cardiac nerves arise and pass to the heart, entering into the 

 formation of the cardiac plexus. The superior cardiac nerve 

 arises from the superior ganglion ; the middle nerve, the 

 largest of the three, arises from the middle ganglion, or from 

 the sympathetic cord, when this ganglion is wanting ; and 

 the inferior nerve arises from the inferior ganglion or the first 

 thoracic. These nerves present numerous communications 

 with various of the adjacent cerebro-spinal nerves, penetrate 

 the thorax, and form the deep and the superficial cardiac 

 plexus, and the posterior and the anterior coronary plexus. 

 In these various plexuses, are found numerous ganglioform 



