574
UNIT 3
Regulation and Integration of the Body
15
(a)
(b)
(c)
Cochlear duct
(
scala media
;
contains
endolymph)
Tectorial membrane
Vestibular membrane
Scala
vestibuli
(contains
perilymph)
Scala
tympani
(contains
perilymph)
Basilar
membrane
Spiral organ
Stria
vascularis
Spiral
ganglion
Osseous spiral lamina
Helicotrema
at apex
Modiolus
Cochlear nerve,
division of the
vestibulocochlear
nerve (VIII)
Cochlear duct
(scala media)
Spiral ganglion
Osseous spiral lamina
Vestibular membrane
Tectorial membrane
Inner hair cell
Outer hair cells
Hairs (stereocilia)
Afferent nerve
fibers
Basilar
membrane
Inner
hair
cell
Outer
hair
cell
Fibers of
cochlear
nerve
Supporting cells
(d)
Figure 15.27
Anatomy of the cochlea.
(a)
Lateral view of part
of the internal ear with a wedge-shaped section removed from the
cochlea.
(b)
Magnified cross section of one turn of the cochlea,
showing the relationship of the three scalae. This cross section has
been rotated from its position in (a).
(c)
Detailed structure of the
spiral organ.
(d)
Electron micrograph of cochlear hair cells (550
3
).
previous page 608 Human Anatomy and Physiology (9th ed ) 2012 read online next page 610 Human Anatomy and Physiology (9th ed ) 2012 read online Home Toggle text on/off