T9.4 Auditory System

Question 1

Adam age 24 is kept up all night by the loud loving making of cats outside his window. The sound attenuation reflex protects his ears from sustained loud noises, what is the correct pairing of activations?

A.Tensor tympani, C VII 
B. Stapedius, CN V
C. Stapedius, CNVIII 
D. Tensor tympani, CN V 
E. Tensor tympani CN VIII 
F.Stapedius CN, VI 

RFA

Answer 1

Ans. D Tensor Tympani CN V

Stapedius is attached to CN VII

Question 2

A 74 year old man suffered a stroke. As a result of the stroke his left inferior colliculus was damage. What would be the expected hearing loss of this patient?

A. Loss of both ears
B. No hearing loss
C. Loss of Right Ear
D. Loss of Left Ear

RFA

Answer 2

Ans. B No hearing loss. While communication to the left temporal lobe is lost the patient can still hear in both ears during a central lesion. Since hearing sensation from both CNVIII go to each auditory cortex.

Unilateral hearing loss is present only in a lesion to the following 1. Ear 2. CN VIII 3. Cochlear Nuclei

Question 3

A 77 year old woman comes to here doctor suffering from presbycusis. Which of these does not effect the same hearing modality?

A. Meniere Disease
B. Mumps 
C. meningitis 
D. Barotrauma
E.Cochlear Trauma  
F. Rubella 

RFA

Answer 3

ANS D. Barotrauma. Presbycusis is progressive hearing loss of the sensorineural hearing.

Of all the choices listed they all effect sensorineural hearing, meaning they affect beyond the oval window ei: the cochlea & CN VIII

Barotrauma effects the Ossicular chain which is before the oval window and is classified as conductive hearing loss.

Question 4

Webers- No lateralization
Rhines- Positive Bilaterally

How/Is the hearing affected?

Answer 4

Normal Hearing

Question 5

How/Is the hearing affected?

Webers - Right Lateralization
Rhines- Positive Bilaterally

Answer 5

Left Sensorineural Loss

Question 6

How/Is the hearing affected?

Webers - Right Lateralization
Rhines- Neg R , Pos L

Answer 6

Right Conduction Loss