Hearing

Question 1

Location of the cochlea

Answer 1

Within the otic capsule, in the petrous portion of the temporal bone

Question 2

Contents of scala tympani

Answer 2

Perilymph

Question 3

Contents of scala vestibule

Answer 3

Endolymph

Question 4

Describe how sound is detected

Answer 4

Causes basilar membrane to vibrate, moves stereocilia of the inner hair cells opening K channels causing depolarisation

Question 5

Describe how sound is amplified

Answer 5

Outer hair cells osscilate at the same frequency as the sound, causes greater degree of vibration

Question 6

Describe how amplitude is coded (Hearing)

Answer 6

Number of action potentials

Question 7

Describe how frequency is coded (Hearing)

Answer 7

Area of the basilar membrane that vibrates

Question 8

Where the basilar membrane is thicker

Answer 8

Nearer the centre

Question 9

Neural path from the inner hair cells to the cochlear nuclei

Answer 9

Distal projections of spiral ganglion nerve innervate inner hair cells, Proximal projections merge to form the cochlear nerve, Merge with the vestibular nerve to form CN VIII

Question 10

Neural path from cochlear nuclei to primary auditory complex

Answer 10

Fibres dessucate to the medial nuclei, then superior olivary complex, along lateral leminiscus, to the inferior colliculus, to the medial geniculate nucleus, then to the primary auditory complex

Question 11

Location of the primary auditory complex

Answer 11

Superior temporal gyrus