Ascending Vs Decending

Question 0

Functions of descending tract

Answer 0

Carry motor impulses away from brain

2 neuron pathway

Question 1

Function of ascending tract

Answer 1

Somatic sensory impulses
3 neuron pathway (1sensory, 2&3 motor)
Towards brain

Question 2

Types of ascending tracts:

Answer 2

• anterior & posterior spinothalamic tracts
• posterior columns
• spinocerebellar tracts

Question 3

Anterior spinothalamic tracts

Answer 3

Relays impulses for touch, pressure, tickle , itch

Question 4

Lateral (posterior) spinothalamic tracts

Answer 4

Relay impulses for pain and temp

Question 5

Posterior columns

Answer 5

Proprioception- exact position of body

Light & vibration sensations

Question 6

Spinocerebellar tracts

Answer 6

Carry impulses from proprioceprors to same side of cerebellum

Question 7

Descending tracts within pyramidal pathways

Answer 7

Corticospinal tracts

Corticobulbar tracts

Question 8

Corticospinal tracts function & start/finish

Answer 8

• controls fine movement of ipsilateral limbs

- starts at cerebral cortex & ends at SC

Question 9

Corticobulbar function & start/finish

Answer 9

• carries motor functions of cranial nerves

- starts at cerebral cortex & ends at brain stem

Question 10

Descending tracts of extrapyramidal tracts?

Answer 10

• rubrospinal
• tectospinal
• vestibulospinal
• reticulospinal

Question 11

Functions of rubrospinal, tectospinal, vestibulospinal, & reticulospinal tracts:

Answer 11

• reg muscle tone
• maintain posture
• coordinate movement with vision

Question 12

Which extrapyramidal tracts decussate?

Answer 12

Rubrospinal & tectospinal- yes

Vestibulospinal & reticulospinal- no