Sensory systems III

Question 1

what modalities are transmitted by the paleospinothalamic tract?

Answer 1

slow, dull, poorly-localized pain sensation

Question 2

what type of peripheral nerve fibers are associated with the paleospinothalamic tract?

Answer 2

C fibers - nonmyelinated

Question 3

where do the axons of second order neurons in the paleospinothalamic tract terminate?

Answer 3

reticular formation - medulla, pons, midbrain

Question 4

where does the spinomesencephalic tract terminate? what is its function?

Answer 4

1. PAG, midbrain raphe nuclei 2. modulate transmission of nociception

Question 5

where does the spinotectal tract terminate? what is its function?

Answer 5

1. superior colliculus 2. causes reflex turning of the head, eyes, and trunk in direction of noxious stimulus

Question 6

where does the spinohypothalamic tract terminate? what is its function?

Answer 6

1. hypothalamus 2. autonomic and reflex responses to noxious stimuli

Question 7

is the spinothalamic tract a crossed tract?

Answer 7

yes

Question 8

what is the result of syringomyelia in the cervical region?

Answer 8

anterior white commissure fibers are damaged, leading to loss of pain and temperature sensation over the shouders and ULs, LMN weakness and atrophy, and possible UMN damage affecting LLs