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Lab 8

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

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Lab 8

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  1. Lab 8 Inner Ear & Auditory Pathways

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

  3. Vestibular membrane 2 1 (space) Scala vestibuli stria vascularis 4 3 (space) Cochlear duct 5 Tectorial membrane Outer hair cells 7 Inner hair cell 6 Spiral lamina 9 8 Auditory nerve fibers 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. 5 Vestibular Membrane 1 6 2 3 4 7 Cross section through one cochlear turn

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

  8. 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. 2 Semicircular canals Facial nerve entering the internal acoustic meatus 1 nerve & opening Jugular bulb 3 MEDIAL ASPECT OF THE TEMPORAL BONE MODEL

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

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

  16. 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 MODEL Semicircular canal 1 2 Cochlea

  18. Semicircular Canals 3 Semicircular Canal 1 2 Vestibule

  19. 2 1 3

  20. 1 2 3

  21. 1 2 (2 nerves)

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

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

  24. lateral lemniscus Superior cerebellar peduncle 1 2 Rostral Pons

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

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

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

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

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

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

  31. Transverse temporal gyrus or planum temporale 1

  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. 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

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