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Neuro Block 2-RG > Somatosensory Pathways > Flashcards

Flashcards in Somatosensory Pathways Deck (19)
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1

Where is the C1 dermatome?

C1 does not have a dermatome

2

Thalamus to cortex: ipsilateral or contralateral?

always ipsilateral

3

What tract contains fibers for fine touch, vibration, and proprioceptive sensation?

medial lemniscal tract

4

What tract contains fibers for pain and temperature?

spinothalamic tract

5

The spinothalamic tracts carries what kind of signals?

pain and temperature

6

Where do fibers carrying pain and temperature information synapse?

dorsal gray horn onto secondary afferent fibers

7

Where do secondary afferent spinothalamic fibers run?

from dorsal gray horn across white commissure to contralateral spinothalamic tract

8

Where are the spinothalamic tracts located?

anterolateral portion of cord cross section

9

Where do fibers of the spinothalamic tract terminate?

ventral posterior lateral thalamus

10

What are the two divisions of the medial lemniscus?

fasciculus gracilis
fasciculus cuneatus

11

What fibers are carried in the fasciculus gracilis?

afferent from lower body

12

What fibers are carried in the fasciculus cuneatus?

afferent from upper body

13

Where do the second order neurons from the spinothalamic tract synapse?

postereoventral lateral (PVL) thalamus

14

Where do the third order neurons from the spinothalamic tract synapse?

PVL thalamus --> cortex

15

What is a somatotropic map?

spacial neuronal relative relationships are preserved throughout somatosensory system

16

What is convergence?

second order neurons receive synapses from 2+ first order afferent neurons --> second order neurons have larger receptive fields

17

Describe a cordotomy

palliative treatment, creating lesion on anterolateral funiculus (spinothalamic tract)

18

Describe a syringomyelia

cyst in center of cord, first causes loss of pain and temperature sensation in upper extremities

19

Brown-Sequard Syndrome

loss of sensation and motor function due to lateral hemisection of the spinal cord