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5 Cards in this Set

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TYMPANIC CAVITY

PROMINENCE OF THE FACIAL CANAL

VS.

PROMINENCE OF THE LATERAL SEMICIRCULAR CANAL
d. Prominence of the facial canal: elevation superior to the oval win-
dow; produced by the facial nerve as it courses posteriorly from the
geniculate ganglion within the facial canal

e. Prominence of the lateral semicircular canal: elevation superior to
the prominence of the facial canal; produced by the ampullary crus
of the lateral semicircular canal
TYMPANIC CAVITY

LATERAL WALL
-consists of...
-"epitympanic recess"
7. Lateral wall

a. Consists primarily of the tympanic membrane; superiorly, it is formed
by the lateral wall of the epitympanic recess, a hollowed-out region
in the roof, superior to the tympanic membrane

b. The epitympanic recess contains the head of the malleus and the body
and short crus of the incus; it opens posteriorly into the aditus ad
antrum
TYMPANIC CAVITY

NERVE SUPPLY
BLOOD SUPPLY
8. Nerve supply: tympanic branch of the glossopharyngeal nerve

9. Blood supply: stylomastoid and anterior tympanic vessels
AUDITORY OSSICLES

MALLEUS (HAMMER)
-describe all parts
C. Auditory ossicles
1. Malleus (hammer)

a. Head: spherical, upper end
b. Neck: constricted portion inferior to the head

c. Anterior process: anteriorly directed spicule arising from the neck

d. Lateral process: conical, lateral projection of the superior end of the
manubrium

e. Manubrium: inferior, elongated projection; its inferior extremity ex-
tends to the umbo
AUDITORY OSSICLES

INCUS (ANVIL)
C. Auditory ossicles
2. Incus (anvil)

a. Body: shaped like a flattened cube; articulates with the head of the
malleus at the incudomalleolar joint

b. Short crus: rounded projection extending posteriorly from the body

c. Long crus: elongated projection descending from the body, parallel
and medial to the manubrium of the malleus; its inferior tip bends
medially and ends in a nodule, the lenticular process