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5 Cards in this Set
- Front
- Back
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 |
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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 |
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TYMPANIC CAVITY
NERVE SUPPLY BLOOD SUPPLY |
8. Nerve supply: tympanic branch of the glossopharyngeal nerve
9. Blood supply: stylomastoid and anterior tympanic vessels |
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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 |
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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 |