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Flashcards in Sensory Systems Deck (10):
0

Where does CN VIII enter the brainstem? Where do fibers of the auditory pathway decussate?

Cerebellopontine angle. Decussates in Trapezoid Body.

1

What is the difference between conduction and sensorineural deafness?

Conduction: prevents sound from reaching Organ of Corti. Ex) obstruction, otitis medius, defect in middle/external ear
Sensorineural: disease of the cochlea/ nerve

2

What are the Weber and Rinne hearing tests?

Weber: Tuning fork at top of skull--> should hear equally in both ears.

Rinne: Vibrating tuning fork on mastoid process, then when in front of hear--> Air conduction > bone conduction.

3

Describe the results of Weber and Rinne test in Conduction and Sensorineural deafness

Conduction: Weber (louder on affected side). Abnormal Rinne test.
Sensorineural: Weber (louder on unaffected side). Normal Rinne test.

4

Which sensory modality is NOT relayed to the thalamus?

Olfactory

5

What can Vit. B1 (Thiamine) intoxication lead cause?

Strachan Syndrome: sensorineural deafness, optic atrophy, and spinal ataxia.

6

What is Kallman Syndrome (lack of formation of oflactory tract)?

Hypothalamic neurons rely on olfactory tract to migrate to destinations. GnRH neurons do not migrate.
Symptoms: anosmia, hypogonadism, and infertility

7

Which nucleus does taste travel to? From which cranial nerves?

Solitary Nucleus.
CN VII (anterior 2/3 tongue) and IX (posterior 1/3 tongue)

8

What is a common finding in Neurofibromatosis Type 2?

Bilateral acoustic neuroma. Rinne test is normal. Weber test may be normal is both ears affected equally.

9

Describe the Pacinian and Meissner and Merkel corpuscles.

Pacinian: coarse spatial differences. Deep pressure, vibration, skin stretch.
Meissner/Merkel: fine spacial differences. Light touch, pressure.