Neurophysiology quiz part one

Coding of sensory information :

• A) Locality is explained by doctrine of specific nerve energies .

• B) Phantom limb is explained by low of projection .

• C) Stimulus intensity is completely. dependent on stimulus amplitude .

• D) duration of stimulation is determined by frequency of action potentials in afferent neurons.

• E) modality of sensation is determined by number of receptors stimulated .

Concerning touch sensation :

• a. Is carried through lateral spinothalamic tract.

• b. Carried by A delta and C fibers .

• c. Carried through both dorsal column and anterolateral tracts .

• d. Doesn't affect pain sensation.

• e. Not affected by cortical lesions.

Depolarization of hair cells in the inner ear occurs due to movement of :

• A) Kinocilium away from the steriocilia .

• B) Kinocilium towards the kinocilia

• C) Steriocilia towards the kinocilium .

• D) Steriocilia away from the kinociulium .

• E) Stereocilia away from the stereocilia .

The frequency of the action potentials in single auditory nerve fibers depends on the:

• a. part of the cochlea from which the fiber originates

• b. place in the organ of Corti that is maximally stimulated

• c. pitch of the sound

• d. loudness of the sound stimuli

• e. frequency of the sound wave.

In hair cells the tip link tie the :

• A. Tip of each steriocilium to the side of its shorter neighbour.

• B. Tip of each steriocilium to the tip of its higher neighbour.

• C. Side of each steriocilium to the side of its higher neighbour.

• D. Side of each steriocilium to the tip of its higher neighbour.

• E. Tip of each steriocilium to the side of its higher neighbour.

In the auditory pathway, mark the WRONG answer:

• A. The hair cells of the Organ of Corti are stimulated by vibration in the tectorial membrane.

• B. The hair cells of the Organ of Corti are innervated by peripheral processes of bipolar cells of spiral ganglion.

• C. The cells of spiral ganglion project centrally as cochlear nerve.

• D. The cochlear nuclei project bilaterally to superior olivary nucleus.

• E. Auditory informations are tonotopically organized.

Regarding hair cells depolarization,Mark the WRONG answer:

• A. They depolarize to -50 mV .

• B. Results in release of Glutamine as neurotransmitter.

• C. Due to opening of mechano-sensitive cation channels.

• D. Is due to Na influx.

• E. Due to vibration of endolymph in scala media .

Which statement regarding the two types of deafness is correct?

• A) An audiogram of a person with conduction deafness would show much greater loss for air conduction than for bone conduction of sound

• B) An audiogram of a person with nerve deafness would show much greater loss for bone conduction than for air conduction of sound

• C) Conduction deafness occurs when the cochlea or cochlear nerve is impaired

• D) Nerve deafness occurs when the physical structures that conduct the sound into the cochlea are

  impaired

• E) Prolonged exposure to very loud sounds is more likely to cause deafness for high-frequency sounds than for low-frequency sounds .

which of the following is a hearing test:

• A. Weber

• B. Schwabach

• C. Rinne

• D. All of the above

• E. B is incorrect .

olivocochlear bundle of efferent fibers end at the bases of :

• A. Inner hair cells in the inner ear .

• B. Both inner and outer hair cells in the inner ear.

• C. Outer hair cells in the inner ear.

• D. Outer hair cells in the organ of Corti.

• E. Inner hair cells in the organ of Corti.