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Auricle
Malleus
Incus
Stapes Vestibular branch
Temporal bone Semicircular canals
External auditory meatus
Cochlear branch
Cochlea
Eustachian tube
Tympanic
membrane
Vestibule
Acoustic or
8th
cranial nerve
B
A
Semicircular
Malleus canals Cochlea
Stapes
Eardrum Incus
Mastoid
sinus
C
Figure 9–7. (A) Outer, middle, and inner ear structures as shown in a frontal section
through the right temporal bone. (B) Section of temporal bone with the auditory bones.
(C) Section of temporal bone showing bony labyrinth of inner ear. The colors on the bone
are artificial. (Photographs by Dan Kaufman.)
QUESTION:What structure is first to vibrate when sound waves enter the ear canal? What
is second?
