Brain - Nervous System Lec 3

Question 1

What is the sensory homunculus?

Answer 1

somatic sensory map of the body

Question 2

What is the pain and temp pathway called?

Answer 2

spinothalamic tract

Question 3

What is the touch and pressure pathway called?

Answer 3

Medial lemniscus pathway

Question 4

Which pathway is the non-discriminative pathway?

Answer 4

spinothalamic

Question 5

Where do first order neurons for upper areas in the discriminative pathway lead to?

Answer 5

cuneate nucleus

Question 6

Where does cross over occur in the discriminative pathway?

Answer 6

at the gracile or cuneate nucleus (interior arcuate fibre)

Question 7

The medial lemniscuc extends from where to where?

Answer 7

medulla to the thalamus

Question 8

Order of areas nerves pass through from limb to primary sensory cortex?

Answer 8

spinal cord –> lower medulla ( where cuneate and gracile nucleus are located) –> Medulla –> pons –> midbrain –> thalamus

Question 9

Where is cross over on the spinothalamic tract?

Answer 9

Anterior white commissure

Question 10

2nd order neurons travel along what tract in the spinothalamic tract pathway?

Answer 10

lateral spinothalamic tract

Question 11

Difference between discriminative and non-discriminative pathways?

Answer 11

D= heavily myelinated, ND = not
D = 50 m/s ND = 1m/s

Question 12

Where does the 1st neuron terminate in the ND pathway?

Answer 12

Grey matter 1 and 2