Sensory Pathway Notes

Question 1

tracts that carry impulses to the sensory areas of the cerebral cortex or other centres

Answer 1

ascending tracts

Question 2

ascending tracts consist of

Answer 2

spinothalamic tracts and dorsal column

Question 3

transmits crude touch and pressure as well as the itch and tickle sensations

Answer 3

ventral (anterior) spinothalamic tract

Question 4

pathway formed from the proximal end of small unmyelinated and poorly myelinated fibers in peripheral nerves, which enter at the lateral aspect of the dorsal horn and ascend and descend up to four segments, and terminate in Rexed’s laminae

Answer 4

lissauer’s tract

Question 5

tract transmits pain and thermoceptive sensations

Answer 5

lateral spinothalamic tract

Question 6

second order neuron of lateral spinothalamic tract terminate where

Answer 6

type C fibers which carry slow pain terminate at the following areas the reticular formation the nonspecific thalamic nuclei (specially the intralaminar nuclei)

Question 7

ventral (anterior) spinothalamic tract terminate at which lamina in spinal cord

Answer 7

terminate at the main sensory nucleus in laminae II,III and V of the dorsal horn gray matter

Question 8

ventral (anterior) spinothalamic tract consist of

Answer 8

consists mainly of type A-delta nerve fibers and some C nerve fibers

Question 9

lateral spinothalamic tract consist of

Answer 9

type A delta nerve fiber (for fast pain and cold) and type C fibers (for slow pain & heat)

Question 10

type a delta fibres of lateral spinothalamic tract synapses with what at the first order neuron

Answer 10

terminate at laminae I and V of the dorsal horn

Question 11

type c fibres of lateral spinothalamic tract synapses with what at the first order neuron

Answer 11

substantia gelatinosa of rolandi (SGR) in laminae II and III of the dorsal horn

Question 12

cortisol lesions are characterised by

Answer 12

inability to localize the side of stimulus loss of two point discrimination