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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 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 Basilar membrane
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
inner hair cell outer hair cells Tectorial Membrane 2 1 3
1 (fluid) 4 5 7 2 (fluid) 6 8 9 3 (fluid)
5 Vestibular Membrane 1 6 2 3 4 7 Cross section through one cochlear turn
This is a cross-section of a cochlea affected by what pathology? Endolymphatic hydrops result from what disease? Endolymphatic Hydrops Meniere’s Disease
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)
Tympanic membrane 1 LATERAL WALL OF MIDDLE EAR
Epitympanic recess 1 (space) LATERAL WALL OF MIDDLE EAR
1 Mastoid antrum and air cells LATERAL WALL OF MIDDLE EAR
Auditory tube 1 LATERAL WALL OF MIDDLE EAR
2 Semicircular canals Facial nerve entering the internal acoustic meatus 1 nerve & opening Jugular bulb 3 MEDIAL ASPECT OF THE TEMPORAL BONE MODEL
Chorda tympani nerve 2 (nerve) Tensor tympani muscle 1 Incus 4 Malleus: head handle 3 LATERAL WALL OF MIDDLE EAR
Stapedius muscle 1 Stapes (on the oval window) MEDIAL WALL OF MIDDLE EAR
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
SUPERIOR VIEW OF TEMPORAL BONE MODEL Semicircular canal 1 2 Cochlea
Semicircular Canals 3 Semicircular Canal 1 2 Vestibule
2 1 3
1 2 3
1 2 (2 nerves)
Auditory Association Cortex Wernicke's Area Planum Temporale 1 What is the ~location of the: Auditory Association Cortex? Wernicke’s Area? Planum Temporale?
Inferior cerebellar peduncle 1 2 Ventral cochlear nucleus Dorsal cochlear nucleus 3 4 Vestibular nuclei Rostral Medulla
lateral lemniscus Superior cerebellar peduncle 1 2 Rostral Pons
Lateral lemniscus 1 Inferior colliculus 2 Pons/Midbrain Junction
Brachium of inferior colliculus 1 Medial geniculate nucleus 2 brachium of superior colliculus 3 4 Superior colliculus Midbrain/Thalamus Transition
Medial geniculate nucleus 1 Lateral geniculate nucleus 2 brachium of superior colliculus 3 4 Superior colliculus Midbrain/Thalamus Transition
3 (nucleus) General position of cochlear nuclei VIII C.N. 1 (nerve) Lateral aperture 4 (opening) 2 inferior cerebellar peduncle IV ventricle 5
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)
1 Inferior colliculus 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
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
MGN What is the ~location of the Medial Geniculate Nucleus? Rostral Midbrain Level