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6 Cards in this Set

  • Front
  • Back
FACIAL NERVE

-HOW DOES IT COURSE?
E. Facial nerve
1. Courses laterally within the internal acoustic (auditory) meatus adjacent
to the vestibulocochlear nerve; at the blind, lateral end of the internal
acoustic meatus, the facial nerve enters the facial canal within the pe-
trous part of the temporal bone
FACIAL NERVE

-ROOF OF VESTIBULE?
-GENICULATE GANGLION?
-CHORDA TYMPANI NERVE?
E. Facial nerve

2. The facial nerve continues laterally within the facial canal along the roof
of the vestibule of the inner ear; as it approaches the medial wall of the
tympanic cavity, it expands at the geniculate ganglion, which contains
the cell bodies of taste fibers that course within the chorda tympani nerve
FACIAL NERVE

GREATER PETROSAL NERVE

-how does it emerge?
E. Facial nerve

3. The greater petrosal nerve courses anteriorly from the geniculate gan-
glion and contains preganglionic parasympathetic fibers from the supe-
rior salivatory nucleus in the brainstem

a. The greater petrosal nerve emerges from the hiatus for the greater
petrosal nerve in the middle cranial fossa and continues anteriorly
in the sulcus for the greater petrosal nerve
FACIAL NERVE

-across foramen lacerum
-deep petrosal nerve
-pterygopalatine fossa
-and more!
b. As the greater petrosal nerve passes horizontally across foramen
lacerum, it is joined by the deep petrosal nerve from the internal
carotid plexus (which contains postganglionic sympathetic fibers),
and becomes the nerve of the pterygoid canal; the nerve of the ptery-
goid canal traverses the pterygoid canal and, when it emerges into
the pterygopalatine fossa, its preganglionic parasympathetic fibers
from the greater petrosal nerve synapse in the pterygopalatine gan-
glion, and its postganglionic sympathetic fibers from the deep pet-
rosal nerve pass through without synapse
FACIAL NERVE

PTERYGOPALATINE GANGLION
VS.
BRANCHES OF THE MAX NERVE.
c. From the pterygopalatine ganglion, postganglionic, parasympathetic,
and sympathetic fibers are distributed to the nasal, palatal, and lac-
rimal glands via branches of the maxillary nerve
FACIAL NERVE

FROM GENICULATE GANGLION...
4. The facial nerve continues posteriorly from the geniculate ganglion,producing the prominence of the facial canal on the medial wall of the tympanic cavity; it then descends within the posterior wall of the tym-
panic cavity and gives rise to the nerve to the stapedius and the chorda
tympani nerve