ascending pathways

Question 1

what is another name for the dorsal column - medial lemniscus pathway

Answer 1

posterior column - medial lemniscus

Question 2

dorsal column - medial lemniscus pathway

Answer 2

carries sensory information from periphery into the spinal cord through dorsal root up through the spinal cord and to the rest of the CNS
-tactile information

Question 3

what is the pathway for the DCML pathway

Answer 3

-fibers enter at dorsal root and into the dorsal white matter
-travels through fasciculus graciliis or cuneatus into the spinal cord and up the the medulla (first synapse)
-crosses midline after synapse and travels within ML
-fibers ascend through rest of the brainstem and midbrain up to the thalamus (second synapse)
-spreads throughout corona radiate into the cortex and going out to S1

Question 4

first order neurons with DCML pathway

Answer 4

those from the dorsal root up until the medulla
-otherwise up until first synapse

Question 5

second order neurons with DCML pathway

Answer 5

from medulla to the ventral nucleus of the thalamus
-after the first synapse up until the second synapse

Question 6

third order neurons with DCML pathway

Answer 6

from ventral nucleus of the thalamus to the cortex
-after the second synapse to the cortex

Question 7

what information does the fasciculus gracilis carry

Answer 7

information from the lower extremities regarding touch and limb position

Question 8

what information does the fasciculus cuneatus carry

Answer 8

information from the upper extremities regarding touch and limb positions

Question 9

what sensory modalities are occurring with the DC-ML

Answer 9

tactile and proprioceptive, discrimination touch, 2 point discrimination, vibratory sense, kinesthesis, and stereognosis

Question 10

decussations

Answer 10

crossing over midline

Question 11

where are the decussations within the DC-ML pathway

Answer 11

at the medulla level

Question 12

anterolateral system

Answer 12

sensory information comes in on dorsal side
-pain and temperature pathway

Question 13

what is another name for the anterolateral system

Answer 13

spinothalmic tract

Question 14

what sensory modalities are occurring with the anterolateral pathway

Answer 14

pain, temperature, and crude touch (not fine detail)

Question 15

dorsal spinocerebellar tract

Answer 15

spinal cord to cerebellum
-sensory information through dorsal root
-uncrossed pathway that carries proprioceptive informaiton

Question 16

what sensory modalities are occurring in the dorsal spinocerebellar tract

Answer 16

subconscious and proprioception from muscle spindles and tendon organs

Question 17

ventral spinocerebellar tract

Answer 17

travels in a ventral location and crosses over

Question 18

what sensory modalities are occurring in the ventral spinocerebellar tract

Answer 18

subconscious proprioception from muscle spindles and tendon organs