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THE NERVOUS SYSTEM. 311

nal jugular vein and iiitenuil carotid artery, crosses over the artery to its
anterior aspect, and descends behind the styloid process and the stylo-
pharyngeus muscle. It then curves
gradually forward over the lower Fig. 150.
])ortion of this muscle and beneath ^.^-^=^^
the hyo-glossus,and reaches the base
of the tongue.
The Superficial orJtif/Hfar Gang-
lion (ganglion of Ehrenritter) is sit-
uated in the upper portion of the
])osterior lacerated foramen to the
outer side of the nerve, only the por-
tion of the nerve in juxtaposition
being involved in the ganglion,
the other portions passing down to
join below with the fibres that have
emerged from the ganglion. It is
from a half to one line in length,
and sends a filament of communi-
cation to the superior cervical gang-
lion.
The Inferior or Petrous Gang-
lion (ganglion of Andersch) is larger diagram ffrom Bendz) of tl.e ( janglia and Commu-
o
\*^ / _&
_ nications of the Divisions oi the Ninth, tenth,
and more important than the iug- and Eleventh Pairs: .J, cerebellum; 7)1, medulla
. -,. ^ -, . i i • • i oblongata; C, spinal cord; 1, root of glosso-
nlar ganglion, and is constant in its pharyngeal nerve; 2, roots of vagus ; 8, roots of
spinal accessory ; 4, jugular ganglion ; 5, petrous
existence. It is about three lines in ganglion : 6, tympanic arch ; 7, ganglion ot the
length, and involves all the hbres root of the vagus ; 8, auricular branch ; 9. gan-
glion of the trunk of viigus ; 10, branch from the
of the nerve. It is situated in a last to the petrous ganglion ; 11, inner portion of
spinal accessory ; 12, outer portion of the same . 13,
depression near the lower margin pharyngeal branch of vagus ; 14, upperlaryngeal
branch; lo, branches to the sympathetic; 16, fas-
of the petrous portion of the tem-
ciculus of spinal accessory prolonged with vagus.
poral bone, and communicates by
branches M'ith the auricular liranch of the pneumogastric nerve, with the
ganglion at the root of the pneumogastric, though this branch is not con-
stant, and frequently the nerve below the ganglion sends communicating
branches to the facial nerve.
A TABLE OF THE BEANCHES OF THE GLOSSO-PHARYNGEAL
NERVE, AND THEIR DISTRIBUTION.
Commiinnicating f Large petrosal nerve.
1. Tympanicbranch, filaments to \ Careolid plexns.
or Jacobson's Small petrosal nerve.
nerve, Brandies of dis- Fenestra ovalis.
GlOSSO - PHARYN- tribution to Fenestra rotunda.
REAL (Ninth
Cranial) Eustacliian tube.
2. Carotid.
Nerve.
3. Pbaryngeal branches (help to form the pharyngeal plexus).
4. Muscular branches (to nuiscles of the pharynx).
5. Tonsillar branches (help to form the tonsillar plexus).
6. Lingual branches.
The Tympanic Nerve (nerve of Jacobson) (Fig. 151) is a long, slender
filament which arises from the petrous ganglion of the glosso-pharyn-
geal, and passes into a canal, the opening to which is situated on the ridge