Neuro Physiology

Question 1

The dorsal column pathway processes sensations of

1. ________
2. ________
3. ________
4. ________
5. ________

Answer 1

1. Fine touch
2. Pressure
3. Two point discrimination
4. Vibration
5. Proprioception

Question 2

The dorsal column pathway is composed of group ___ fibers

Answer 2

Group II

Question 3

What are the nuclei that are associated with the pathway that delivers sensations of fine touch. pressure, two point discrimination, vibration, and propioception?

Answer 3

Nucleus gracilis and nucleus cutaneous

Question 4

The anterolateral system processes sensations of

1. ________
2. ________
3. ________

Answer 4

Temperature
Pain
Light Touch

Question 5

Fast pain is carried by group ___ fibers while slow pain is carried by ___ fibers

Answer 5

III

C

Question 6

Cutting the optic nerve results in what?

Answer 6

Blindness in the ipsilateral eye

Question 7

Cutting the optic chasm results in what?

Answer 7

Heteronymous Bitemporal hemianopia

Question 8

Cutting the optic tract results in what?

Answer 8

homonymous contralateral hemianopia

If the right tract is damaged then there will be left sided field vision absent in each eye

Question 9

Cutting the geniculocalcarine (from the LGN to the occipital lobe) tract causes what?

Answer 9

homonymous hemianopia with macular sparing

Question 10

Light on the retina is converted from __________ to _________ with the help of vitamin A

Answer 10

11 cis-retinal to all trans retinal

Question 11

What happens in regards to eyesight when there is a vitamin A deficiency?

Answer 11

There is night blindness

Question 12

The fluid inside the ducts of the inner ear is called what?
Where is it found?
Describe its electrolyte composition

Answer 12

Endolymph fills the inside of the ducts and is found primarily in the Scala media

Endolymph is high in K+

Question 13

The fluid outside the ducts of the inner ear is called what?
Where is it found in the inner ear?
Describe its electrolyte composition

Answer 13

Perilymph is found in the Scala vestibuli and the Scala tympani

Perilymph is high in Na+

Question 14

The _____ of the basilar membrane (near the oval window) is narrow and stiff and is able to hear ____ frequencies

Answer 14

The base of the basilar membrane is able to hear high frequencies

Question 15

The _____ of the basilar membrane (near the helicotrema) is wide and compliant and is able to hear ____ frequencies

Answer 15

apex of the basilar membrane is able to hear low frequencies

Question 16

Nystagmus occurs in the (same/different) direction of head rotation

Answer 16

SAME unless it is post rotary nystagmus where it is opposite

Question 17

The anterior two thirds of the tongue is innervated by what?
The main type of taste bud that is found here is what?

Answer 17

Innervated by the chordates tympani of CN VII

fungiform papillae

Question 18

The posterior one third of the tongue is innervated by what?
The main types of taste buds that are found here are what?

Answer 18

Innervated by the CN IX

circumvallate and foliate papillae

Question 19

If a patient comes in and is not able to maintain good postural support. Where would you suspect to see a lesion on further examination?

Answer 19

Globus pallidus

Question 20

IF a patient comes in and has hemiballismus on the right side, where would you expect to see a lesion?

Answer 20

Left subthalamic nucleus