138 



ANATOMY. 



FIG. 64. 



its motor root from the facial by the chorda tympani, its sympathetic root from 

 the facial plexus. Its branches are distributed to the submaxillary gland, its 

 duct, and the mucous membrane of the mouth. 



What Nerves appear on removing the Gasserian Ganglion ? The 

 three Petrosal branches of the 7th nerve (see page 131), lying on the petrous 

 portion of the temporal bone, and communicating with the sympathetic system 

 as follows, viz., the 



Large Superficial Petrosal * (Great Petrosal), a branch of the yth nerve, 



from its geniculate ganglion, 2 Jintu- 

 mescentia gangliformis), which passes 

 through the hiatus Fallopii, and 

 thence through the foramen lacerum 

 medium to the Vidian canal, where 

 it joins the large deep petrosal 

 from the carotid plexus, to form 

 the Vidian nerve, as which it goes 

 to Meckel's ganglion (page 137), 

 forming its motor root. 

 Small Superficial Petrosal * (Small Pe- 

 .trosal), immediately external to the 

 preceding, going from the geniculate 

 ganglion of the 7th to the otic gan- 

 glion, and lying directly over the tensor 

 tympani muscle. 



External Superficial Petrosal? (External Petrosal), going from the 7th to 

 the sympathetic plexus on the middle meningeal artery. 6 



Describe the Cervical Ganglia. They are 3 in number on each side, of 

 which the superior is the largest, communicate with each other, and are as fol- 

 lows, viz. 



Superior Cervical Ganglion, lies behind the carotid sheath opposite the 2d 



and 3d cervical vertebrae. Its branches are distributed to the carotid, 



cavernous, and pharyngeal plexuses, and one of its internal branches is 



the superior cardiac nerve going to the cardiac plexus. 

 Middle Cervical Ganglion, on the superior thyroid artery, opposite the 5th 



cervical vertebra, and gives off the middle cardiac nerve to the cardiac 



plexus, also communicating branches. 

 Inferior Cervical Ganglion, on the superior intercostal artery, between the 



neck of the 1st rib and the transverse process of the 7th cervical vertebra. 



It gives off several communicating branches and the inferior cardiac nerve 



to the cardiac plexus. 



