Page 102 - Edited - Webster HEAD AND NECK - part 2-Merge PDF

HN 296 THE FACIAL NERVE & THE TYMPANIC CAVITY

HN 296
(A) GENERAL RELATIONS

B

TYMPANIC PETROSAL NERVE : to middle fossa & V2
MEMBRANE ( )
FIRST BEND OR "KNEE": the
(SENSORY) GENICULATE GANGLION
IS FOUND HERE.
FACIAL CANAL: arises/begins at
bottom of INTERNAL AUDITORY MEATUS,
INTERNAL AUDITORY MEATUS ("tube")

K.E.W. FACIAL NERVE (Cr NVII) SHARES INTERNAL
AUDITORY MEATUS WITH Cr N VIII.
FACIAL CANAL
SECOND BEND: FACIAL NERVE TURNS DOWNWARDS
CHORDA TOWARD STYLOMASTOID FORAMEN - which
TYMPANI is the external end of the facial canal.
B leaves facial n. & enters tympanic cavity
st
POSITION OF 1 BEND & GENICULATE (see below).
GANGLION OF FACIAL NERVE
TEGMEN TYMPANI
(B). CLOVEN ALONG PLANE FOR TENSOR
TYMPANI MUSCLE
B-B THE CAVITY ADDITUS → MASTOID
ANTRUM
BONY
CAN BE OPENED & ITS AUDITORY
OVAL
MEDIAL & LATERAL WALLS TUBE WINDOW SECONE BEND
EXAMINED
POSTERIOR
I MEDIAL WALL INTERNAL
CAROTID
ARTERY PYRAMID:
ANTERIOR CAVITY
KEW CONTAINS
STAPEDIUS
PROMONTORY
(COCHLEA-Ist MUSCLE
TURN) TO STYLOMASTOLID
FORAMEN
ADDITUS ROUND WINDOW
SECOND MALLEUS
BEND TEGMEN TYMPANI
FOR TENSOR
TYMPANI MUSCLE II LATERAL WALL
BONY The cavity has bea
POSITION OF FACIAL CANAL and as spine.
AUDITORY TUBE
POSTERIOR ANTERIOR opened like a book,
using its anterior

The CHORDA TYMPANI
is “the cord of the dorem”

sense.
FOR CHORDA –literally, in a geometrical
TO STYLOMASTOID K.E.W. TYMPANI
FORAMEN TYMPANIC Hense
MEMBRANE
part)