Stowell.] 92 [March 2, 
N. tonsillaris.—About 10 mm. peripherad of the first R. pharyngeus a 
ramus (Fig. Ton.) is given to the tonsil and to its enveloping capsule. 
The function of this nerve is not known. 
N. papillaris.—The terminal filaments (Fig. Papille) may be traced to 
the long papille (circumvallate ?) 15 mm. peripherad of the Os hyoides, 
upon the base of the tongue. These filaments are in the most restricted 
sense, the nerves of taste. 
SUMMARY. 
A. ANATOMICAL. 
Ectal Origin.—By 5-6 funiculi in the depression line caudad of the 
eminentia auditoria, dorsad of the oliva and cephalad of the dorsal roots 
of the N. vagus. 
Foramen of Exit.—Foramen jugulare. 
Intercranial Course.—In the passage through the jugular fossa, the N. 
glosso-pharyngeus is the cephalic one of the structures which traverse the 
foramen. At the central end of the fossa, the nerve bears a ganglion, the 
G. ehrenritteri, which is ectal in position and does not involve the entire 
trunk, 
Ectocranial Trunk.—The first 5-7 mm. of the ectocranial trunk are 
intimately associated with the plexus gangliformis which involves the 
central portions of the vagus, the accessorius, the hypoglossus, and the 
sympathic nerves, from which plexus it is generally distinct, although it 
contributes a considerable ramus (possibly this is an accession to the 
glosso-pharyngeus from the accessorius). 7% mm. peripherad of the fora- 
men of exit the nerve is involved in a small fusiform ganglion. 
G. petrosum and its Communicating Rami.—This fusiform ganglion 
involves the entire nerve-trunk ; it is easily overlooked in the enveloping 
connective tissue and the adjacent plexus. From its ental surface a single 
trunk or four adjacent anastomotic rami take their ectal origins as follows : 
the ventral one to the cephalic cervical ganglion of the N. sympathicus ; 
one just caudad and the largest joins the G. inferius of the vagus nerve ; 
dorsad of this ramus the second in size is given to the plexus gangliformis, 
a portion of which seems to be traceable to the N. accessorius ; the dorsal 
slender filament joins the ramus auricularis from the root ganglion, G. 
jugulare, of the vagus to the geniculate ganglion of the N. facialis. From 
the cephalic border of the ganglion the large tympanic branch, or Jacob- 
son’s nerve, lies in a fossa entad of the ectal bulla tympanica adjacent to 
a branch from the cervical sympathic ganglion. The tympanic nerve 
divides into four branches as follows: one of the roots of the great super- 
ficial petrosal nerve, the principal root of the small petrosal nerve which 
terminates in the otic ganglion, a slender filament which joins the eusta- 
chian plexus, and the branch to the tympanic plexus. 
Principal Rami. 
1. Muscular ; a branch to the pharyngeal constrictor muscles (Fig. M. 
Phar.) has its ectal origin about 14 mm. peripherad of the G. petrosum. 
