Lab 8
Inner Ear & Auditory Pathways
Part
7 of spiral ganglion
Scala vestibuli
1
Scala media
2
(cochlear duct)
Auditory
part of VIII nerve
8
modiolus
9
3
Scala tympani
Artifact space
Vestibular
4
membrane
Stria vascularis
5
6
Basilar membrane
Part
10 of spiral ganglion
Vestibular
2
membrane
Scala
vestibuli
1 (space)
Cochlear
duct
3 (space)
Tectorial 5
membrane
Outer hair
7cells
Inner hair
6
cell
Auditory nerve
8 fibers
Spiral lamina
9
Basilar membrane
11
Scala
tympani
10
(space)
stria
4
vascularis
Tectorial
Membrane
2
inner
1
hair cell
3 cells
outer hair
1
4
(fluid)
5
2 (fluid)
6
7
8
9
3 (fluid)
5
Vestibular Membrane
1
2
6
3
4
7
Cross section through one cochlear turn
This is Endolymphatic
a cross-section hydrops
of a cochlea
resultaffected
from what
by what
disease?
pathology?
Endolymphatic
Meniere’s Disease
Hydrops
Petrotympanic
1
fissure
(bony recess)
Mastoid
2
(bony landmark)
process
Chorda
tympani nerve
5 (nerve)
Facial3nerve
exiting
nerve
the
stylomastoid
&
foramen
opening
Styloid
4
(bony
landmark)
process
LATERAL ASPECT
OF TEMPORAL
BONE MODEL
Tympanic
1
membrane
LATERAL WALL
OF MIDDLE EAR
1 (space)recess
Epitympanic
LATERAL WALL
OF MIDDLE EAR
Mastoid
antrum1and air
cells
LATERAL WALL OF
MIDDLE EAR
Auditory
1 tube
LATERAL WALL
OF MIDDLE EAR
2
Semicircular
canals
Facial1 nerve
entering
nerve the
&
internal
opening
acoustic
meatus
MEDIAL ASPECT OF THE
TEMPORAL BONE MODEL
Jugular
3
bulb
Chorda
tympani
2
nerve
(nerve)
Tensor tympani
muscle
1
Incus
4
Malleus:
head
handle
LATERAL WALL
OF MIDDLE EAR
3
1
Stapedius
muscle
Stapes (on the
oval window)
MEDIAL WALL OF
MIDDLE EAR
1 (internal
Facialopening)
canal
Facial nerve
2
exiting
facial
nerve
&
canal through
opening
the stylomastoid
foramen
MEDIAL WALL OF
MIDDLE EAR
Promontory
(basal
3
turn of cochlea) tympanic plexus
containing fibers of CN
IX covers the promontory
during life
SUPERIOR VIEW
OF TEMPORAL
BONE MODEL
Semicircular
1
canal
2Cochlea
Semicircular
Canal 1
2
Vestibule
Semicircular
Canals 3
2
1
3
1
2
3
1
2
(2 nerves)
1
What is the ~location of the:
Auditory Association Cortex?
Wernicke’s Area?
Planum Temporale?
Inferior cerebellar
1
peduncle
2
Ventral cochlear nucleus
Dorsal cochlear nucleus
3
Vestibular
nuclei
4
Rostral Medulla
lateral
1
lemniscus
Superior cerebellar
2
peduncle
Rostral Pons
Lateral
1
lemniscus
Inferior
2
colliculus
Pons/Midbrain Junction
Brachium of inferior
1
colliculus
Medial geniculate
2
nucleus
brachium of
superior3colliculus
Superior4colliculus
Midbrain/Thalamus Transition
Medial geniculate
1 nucleus
Lateral geniculate
2 nucleus
brachium of
3
superior colliculus
Superior4colliculus
Midbrain/Thalamus Transition
General position
(nucleus)nuclei
of3 cochlear
VIII
1 (nerve)
C.N.
4 (opening)
Lateral
aperture
inferior
2
cerebellar
peduncle
IV
5 ventricle
basilar artery with origin of
4
bircumferential
branches
cochlea
1
semicircular
2
canals
3vestibulo(nerve)
cochlear n.
nerve
internal
auditory
5 (opening)
meatus
(opening in skull)
Inferior colliculus
1
We DON’T need to distinguish b/t superior/inferior colliculi in clinical scans.
Transverse temporal
gyrus or
planum temporale
1
Ventral Cochlear Nucleus
Dorsal Cochlear Nucleus
- located lateral & dorsal to the inferior
cerebellar peduncle (restiform body)
- contain cell bodies of second order
neurons in auditory path
- receive fibers from cochlear nerve
- will send axons into the acoustic stria
What is the ~location of the:
Dorsal Cochlear Nucleus?
Ventral Cochlear Nucleus?
Rostral Medulla Level
lateral lemniscus and
nuclei of lateral lemniscis
What is the ~location of the
Lateral Lemniscus?
Rostral Pons Level
Lateral
Lemniscus
Snake eating egg
Inferior
Colliculus
What is the ~location of the:
Inferior Colliculus?
Lateral Lemniscus
Pons/Midbrain Junction
Brachium of
Superior
Colliculus
Brachium of
Inferior
Colliculus
Superior Colliculus
Medial
Geniculate
Nucleus – receives
fibers from brachium of
What is the ~location of the:
inferior colliculus
Superior Colliculus?
Brachium of the Superior Colliculus?
Medial Geniculate Nucleus
Brachium of the Inferior Colliculus
Rostral Midbrain Level
MGN
What is the ~location of the
Medial Geniculate Nucleus?
Rostral Midbrain Level