the spinal cord and periphery Flashcards Preview

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Flashcards in the spinal cord and periphery Deck (25):
1

what part of the spinal cord contains grey matter?

central part

2

what part of the spinal cord contains white matter?

peripheral parts

3

what are the two areas of grey matter?

dorsal and ventral horns

4

what is contained within the dorsal horn?

the axons of sensory fibres enter through the dorsal root into the dorsal horn of grey matter

5

what is contained within the ventral horn?

motor neuron cell bodies

6

what is a tract?

axons transmitting information between higher centres in the brain and peripheral nerves

7

what kind of information do ascending tracts carry?

sensory

8

what kind of information do descending tracts carry?

motor

9

what are the 3 columns that white matter is arranged in?

posterior
lateral
anterior

10

what are some common features of ascending spinal tracts?

there are 3 neurons between the peripheral receptor and cortex
at the synapse between the 3rd order neuron and the 2nd order neuron the 2nd order neuron crosses over to the contralateral side in the spinal cord or medulla

11

what makes up the posterior column?

gracile and cuneate fasciculi

12

what afferent information is carried to the brain via the posterior column?

fine touch
tactile localisation
vibration sense
proprioception

13

what does the lateral spinothalmic tract on the right side of the body transmit?

pain and temperature from the left side of the body (and vice versa)

14

where do the descending tracts of the spinal cord originate?

cerebral cortex and brainstem

15

how many neurons do descending tracts that originate in the spinal cord have in their pathway?

2

16

where do descending tracts decussate?

they decussate to the opposite side in the brainstem

17

what does the pyramidal tract control?

voluntary skilled movements

18

what supplies the pyramidal tract?

middle cranial artery

19

where do the corticobulbar fibres terminate?

brainstem

20

where do the corticospinal fibres terminate?

spinal cord

21

what is the lower motor neuron responsible for?

muscle tone and reflexes

22

what happens if the UMN is damaged with the LMN intact?

reflexes and tone are exaggerated

23

what is a reflex?

an involuntary stereotyped pattern of response brought about by a sensory stimulus

24

where are spinal reflexes mediated?

level of the spinal cord

25

what does the autonomic nervous system refer to?

nerve cells concerned with innvervation and control of visceral organs, smooth muscles and secretory glandds