Auditory/Vestibular Anatomy Flashcards Preview

Neuroanatomy > Auditory/Vestibular Anatomy > Flashcards

Flashcards in Auditory/Vestibular Anatomy Deck (12)
Loading flashcards...
1
Q

2 Nerves of Ext Ear

A

Mostly V3, some X

2
Q

2 Main Sections of Tympanic Membrane

A

Pars flaccida and tensa (larger, vibrates)

3
Q

2 Windows

A

Oval which stapes pushes against and round as relief valve

4
Q

Vestibular N VIII

A

Bipolar cells that go to vestibular nuclei (or some project to cerebellum)

5
Q

3 Adjacent Ducts in Cochlear System

A

Scala vestibuli and tympani - perilymph filled

Scala media - endolymph filled

6
Q

Helicotrema

A

End of cochlea where scala vestibuli and tympani meet

7
Q

Propagation to Hair Cells

A

Sit on organ of Corti (in scala media) which is on basilar membrane b/w media and tympani. As perilymph in tympani moves, moves basilar membrane, pushing organ of Corti and hair cells against tectorial membrane, opening them

8
Q

Cochlear Pitch Differentiation

A

Different Hz/wavelengths vibrate different parts of cochlear ducts. High pitches near round window and low pitches near helicotrema

9
Q

Cochlear Nervous Pathway

A

Bipolar axons from cochlea, vestibulocochlear n. VIII w/ cell bodies in spiral ganglia, dorsal and ventral cochlear nuclei, 2nd order form dorsal and ventral cochlear nuclei, some cross at trapezoid body (goes up bilaterally), some synapse in superior olivary nuclei, ascend in lateral lemniscus to inferior colliculus (synapse), brachium of inferior colliculus to medial geniculate nucleus for thalamic relay, then auditory cortex

10
Q

Left/Right Sound Descrimination

A

Each side bilaterally goes to each superior olive. It takes longer for signal from opposite side to reach, so it calculates which side the sound is on

11
Q

Lesion in Internal Acoustic Meatus Effects

A

Hearing/vestibular/VII - taste ant 2/3, parasymp to non-parotid glands, etc gone

12
Q

Acoustic Neuroma

A

Tumor in inner ear that bulges out, but puts pressure on VII and VIII