1. Inner Ear & Auditory Pathways
Lab 8
Inner Ear & Auditory Pathways

2. 7 1 8 2 9 3 4 10 5 6 Part of spiral ganglion Scala vestibuli
Auditory part of VIII nerve
Scala media
(cochlear duct) 2
modiolus 9 3
Scala tympani
Artifact space 4
Vestibular
membrane
Part of spiral ganglion 10
Stria vascularis 5 6
Basilar membrane

3. 2 1 (space) 4 3 (space) 5 7 6 9 8 11 10 (space) Vestibular membrane
Scala vestibuli
1 (space)
stria
vascularis 4
Cochlear duct
3 (space) 5
Tectorial membrane
Outer hair
cells 7
Inner hair
cell 6
Spiral lamina 9
Auditory nerve fibers 8
Basilar membrane 11
10 (space)
Scala tympani

4. inner
hair cell
outer hair cells
Tectorial Membrane 2 1 3

5. 1
(fluid) 4 5 7
2 (fluid) 6 8 9
3 (fluid)

6. Cross section through one cochlear turn5
Vestibular Membrane 1 6 2 3 4 7
Cross section through one cochlear turn

7. Endolymphatic hydrops result from what disease?
This is a cross-section of a cochlea affected by what pathology?
Meniere’s Disease
Endolymphatic Hydrops

8. Chorda tympani nerve Styloid process Mastoid process 1 (bony recess)
Petrotympanic fissure
Mastoid process 2
(bony landmark)
5 (nerve)
Chorda tympani nerve
Facial nerve exiting the stylomastoid foramen 3
nerve
&
opening
LATERAL ASPECT OF TEMPORAL BONE MODEL
Styloid process 4
(bony landmark)

9. Tympanic membrane 1
LATERAL WALL OF MIDDLE EAR

10. Epitympanic recess
1 (space)
LATERAL WALL OF MIDDLE EAR

11. 1
Mastoid antrum and air cells
LATERAL WALL OF MIDDLE EAR

12. Auditory tube 1
LATERAL WALL OF MIDDLE EAR

13. Facial nerve entering the internal acoustic meatus
Semicircular canals 2
Facial nerve entering the internal acoustic meatus 1
nerve
&
opening 3
Jugular bulb
MEDIAL ASPECT OF THE TEMPORAL BONE MODEL

14. Incus Malleus: head handle Chorda tympani nerve 2 (nerve)1
Tensor tympani muscle
Incus 4 3
Malleus:
head
handle
LATERAL WALL OF MIDDLE EAR

15. Stapes (on the oval window)1
Stapedius muscle
Stapes (on the oval window)
MEDIAL WALL OF MIDDLE EAR

16. Facial nerve exiting facial canal through the stylomastoid foramen
1 (internal opening)
Facial canal
Facial nerve exiting facial canal through the stylomastoid foramen 2
nerve
&
opening
Promontory (basal turn of cochlea) - tympanic plexus containing fibers of CN IX covers the promontory during life 3
MEDIAL WALL OF MIDDLE EAR

17. SUPERIOR VIEW OF TEMPORAL BONE MODEL1
Semicircular canal 2
Cochlea

18. 3
Semicircular
Canals
Semicircular
Canal 1
Vestibule 2

19. 2 1 3

20. 1 2 3

21. 1 2
(2 nerves)

22. What is the ~location of the: Auditory Association Cortex?
Wernicke's Area
Planum
Temporale
Auditory
Association
Cortex 1
What is the ~location of the:
Auditory Association Cortex?
Wernicke’s Area?
Planum Temporale?

23. Rostral Medulla 1 2 3 4 Inferior cerebellar peduncle
Ventral cochlear nucleus
Dorsal cochlear nucleus 3
Vestibular nuclei 4
Rostral Medulla

24. lateral
lemniscus
Superior cerebellar
peduncle 1 2
Rostral Pons

25. Pons/Midbrain Junction
Lateral
lemniscus 1
Inferior
colliculus 2
Pons/Midbrain Junction

26. Midbrain/Thalamus Transition
Brachium of inferior
colliculus 1
Medial geniculate
nucleus 2
brachium of
superior colliculus 3 4
Superior colliculus
Midbrain/Thalamus Transition

27. Midbrain/Thalamus Transition
Medial geniculate
nucleus 1
Lateral geniculate
nucleus 2
brachium of
superior colliculus 3 4
Superior colliculus
Midbrain/Thalamus Transition

28. Lateral aperture IV ventricle General position 3 (nucleus)
of cochlear nuclei
VIII
C.N.
1 (nerve)
Lateral
aperture
4 (opening)
inferior
cerebellar
peduncle 2
IV ventricle 5

29. 4 1 2 5 (opening) 3 (nerve) basilar artery with origin of
bircumferential branches 4 1
cochlea 2
semicircular
canals
vestibulo-
cochlear n.
nerve
3 (nerve)
5 (opening)
internal auditory
meatus
(opening in skull)

30. 1
Inferior colliculus
We DON’T need to distinguish b/t superior/inferior colliculi in clinical scans.

31. 1
Transverse temporal
gyrus or
planum temporale

32. 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

33. lateral lemniscus and
nuclei of lateral lemniscis
What is the ~location of the Lateral Lemniscus?
Rostral Pons Level

34. What is the ~location of the: Inferior Colliculus?
Lateral Lemniscus
Snake eating egg
Inferior Colliculus
What is the ~location of the:
Inferior Colliculus?
Lateral Lemniscus
Pons/Midbrain Junction

35. Superior Colliculus
Brachium of Superior Colliculus
Brachium of Inferior Colliculus
Medial Geniculate Nucleus – receives fibers from brachium of inferior colliculus
What is the ~location of the:
Superior Colliculus?
Brachium of the Superior Colliculus?
Medial Geniculate Nucleus
Brachium of the Inferior Colliculus
Rostral Midbrain Level

36. MGN
What is the ~location of the Medial Geniculate Nucleus?
Rostral Midbrain Level