454
UNIT THREE
Semicircular
canals
Cochlear nerve
Maculae
Utricle
Vestibular nerve
Membranous labyrinth
(contains endolymph)
Bony labyrinth
(contains perilymph)
(a)
(b)
Cochlea
Cochlear
duct (cut)
containing
endolymph
Scala
vestibuli (cut)
Scala
tympani (cut)
Round
window
Saccule
Oval
window
Ampullae
Vestibule
Endolymph
Perilymph
Membranous labyrinth
Bony labyrinth
Cochlear nerve
Modiolus
Helicotrema
Spiral ganglion
Vestibular membrane
Spiral lamina
Cochlear duct
(scala media)
FIGURE 12.11
In the inner
ear (
a
) perilymph separates
the osseous labyrinth from the
membranous labyrinth, which
contains endolymph. (
b
) The spiral
lamina coils around a bony core,
the modiolus.
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