AURICULAR OR OTIC GANGLION OF ARNOLD. 



477 



nerve of the tensor tympani muscle, which comes off from 

 this ganglion. 



Fig. 205.* > 



This is the usual method of describing the course of this 

 nerve, but we might, according to Breschet, with equal pro- 

 priety adopt the views of Arnold, and consider it as arising 

 from the ganglion which is evidently the fact in regard to 

 many of the inferior animals, as the nerve is larger near the 

 ganglion, than in the tympanic cavity. As it enters the tym- 

 panum, it gives off one filament to the fenestra rotunda and 



* Fig. 205 exhibits a view of the auricular ganglion of Arnold and its connex- 

 ions with surrounding parts. A, Right side of the cranium. B, Petrous portion 

 of the temporal bone. C, Cribriform plate of the ethmoid bone. D, Turbinated 

 bone. E, Carotid artery. F, Internal jugular vein, a, Auricular ganglion or 

 ganglion of Arnold, sending off its branches to the tympanum, to the soft palate, 

 and its descending twigs of communication, b, Ganglion of Meckel, or spheno- 

 palatine ganglion, c, Ganglion of Gasser, orsemilunar ganglion of the fifth pair 

 of nerves, d, Opthalmic nerve, e, Superior maxillary nerve. /, Inferior max- 

 illary nerve, g, Chorda tympani. h, Malleus, z, Incus, k, Glosso-pharyngeal 

 nerve. I, Ganglion formed on this nerve, called ganglion of Andersch or ganglion 

 petrosum. m, m, Branches from it through the tympanum to the auricular gang- 

 lion called Jacobson's Anastomosis, n, Branches of communication between 

 this nerve, and the carotid plexus and ganglion, o. P. 



