Stowell. ] 90 [March 2, 
in the same nerve appears when the relation of food-stuffs to life is con- 
sidered. The inverted muscular reaction which ensues upon the applica- 
tion of an unnatural or irritating stimulus is another characteristic of this 
nerve. 2 
The conflicting evidence of Bell, Longet, Panizza, Reid, Mayo, Bernard, 
Chauveau, and other experimenters, leaves grave doubt as to the suscep- 
tibility of the N. glosso pharyngeus to receive painful impressions. 
I am not aware that the function of the tonsillar branch has been de- 
monstrated. 
Ectal Origin.—The ental roots (5-6 funiculi) constitute a small nerve- 
trunk whose ectal origin is in the depression line dorsad of the oliva, the 
line of origin of the dorsal roots of the N. vagus [indeed, the cephalic 
funicle of the vagus seems to belong to the root funiculi of the glosso- 
pharyngeus]. ‘The trunk so formed lies ventrad of the plexus choroideus 
lateralis and passes laterad to the foramen of exit. 
Foramen of Exit.—The nerve takes its exit from the cranium through 
the foramen jugulare in connection with the vagus and the accessorius 
nerves, the jugular vein, and a small arteriole from the A. occipitalis. 
Intercranial Course and Root Ganglion.—In the passage through the 
jugular fossa the sheath of the N. glosso-pharyngeus is distinct from and 
cephalad of the common sheath of the vagus and the accessorius and is 
separated by the arteriole above referred to. At the central end of the 
fossa the N. pharyngeus bears a small pinkish ganglion (G. ehrenritteri, 
G. nervi glosso-pharyngei superius, G. jugulare superius, G. mulleri). This 
ganglion lies upon the: ectal surface and the ventral border of the G. jug- 
ulare of the N. vagus, but it does not appear to have structural relations 
with the ganglion. The ganglion (G.Ehr.) is ectal and does not involve 
all of the fibres of the trunk. 
Plexus gangliformis, Pl. nodosus.—The central 5 mm. of the ectocra- 
nial trunk are closely apposed to, if not involved in the somewhat intri- 
cate net-work of vessels and tissues which characterize this region and 
form the gangliform or nodose plexus (Fig. Gang.). The apposed trunks 
of the glosso pharyngeus, the vagus, the accessorius, the hypoglossus, and 
the sympathic nerves by a peculiar interlacing of fibres and by anastom- 
otic rami sustain intimate inter-relations. There is reason for thinking 
that through this plexus, the glosso-pharyngeus is connected with the 
, accessorius (the complications involved in identifying rami in this plexus 
leave some doubt regarding the precise structure of this plexus). The 
glosso-pharyngeus is ectal in this group and is possibly separable from the 
ental nerves. 
G. petrosum and its Commiunicating Rami.—At the caudal border of 
the plexus gangliformis the glosso-pharyngeus presents a fusiform enlarge- 
ment, the ganglion petrosum (Fig. Pe.), ganglion of Andersch. This is 
the ganglion of the trunk and is about 2 mm. X 1 mm; it seems to in- 
volve the entire nerve-trunk. Its communicating rami are five, as follows: 
