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Flashcards in BRS Spinal Cord Deck (28):
1

the spinal cord extends to the level of L___ in newborns but will be at the level of L____ inadults

L3 in newborns
L1 in adults

2

what are the borders of the spinomedullary junctions

foramen magnum
pyramidal decussation
emergence of first cervical nerve rootlets

3

the first cervical nerve and the coccygeal nerve are unique in that

they contain no dorsal root (no sensory)

4

meningeal ramus of the SC innervates

meninges and vertebral column

5

the gray communicating rami contains what type of fibers

unmyelinated postganglionic sympathetic fibrers

6

the ventral median fissure underlies what artery?

anterior spinal a

7

lamina 1 is associated with what innevation

light touch
pain
temp

8

what is lamina 2 known as

substantia gelatinosa
homologous to spinal trigeminal nucleus
light touch, pain, temp

9

myotatic reflex

monosynaptic
afferent - muscle spindle and DRG of its 1a fiber
efferent - ventral horn motor neuron

10

ascending pathways include

posterior column-medial lemniscus pathway
anterolateral system
lateral spinothalamic tract
dorsal spinocerebellar tract
ventral spinocerebellar tract
cuneocerebellar tract

11

the posterior column-medial lemniscus pathway conveys what information to the thalamus

tactile discrimination, vibration, proprioception

12

the PCML pathway receives input from what type of receptors

pacini
meissner corpuscles
joint recpetors
muscle spindles
golgi tendon organs

13

the cell bodies for the first order neurons of the PCML pathway can be found where

dorsal root ganglia at all levels

14

the first order neurons of the PCML pathway give rise to the fasciculus gracilis, originating from the _____ extremity and the fasciculus cuneatus, arising from the ______ extremity

gracilis = lower extremity
cuneatus = upper extremity

15

the cell bodies of the second order neurons in the PCML pathway are located within

the gracilis or cuneatus nuclei in the medulla

16

after synapsing in the nuclei in the medulla, the PCML pathway continues on the _____ ______ fibers before decussating to form the _______ lemniscus

gracile and cuneate nuclei --> internal arcuate fibers --> decussate --> medial lemniscus

17

the medial lemniscus carries proprioceptive input to the contralateral brainstem, terminating in the ____ of the thalamus

ventral posteriolateral nuclei

18

third order neurons in the PCML pathway transverse the ______ _______ of the internal capsule to project to the somatosensory cortex

posterior limb of the internal capsule

19

where do PCML fibers decussate

2nd order neurons from the gracile and cuneate nuclei cross the midline in the medulla

20

the anterolateral system carries what kind of information

light touch from free nerve endings and merkel tactile discs

21

the anterolateral system makes up what two tracts

ventral and lateral spinothalamic systems

22

the spinothalamic system crosses the midline at the _____ ______ commissure to ascend to the contralateral ventral funiculus

anterior white commissure

23

third order neurons of the spinothalamic system are found where in the thalamus

VPL nucleus of hte thalamus

24

the lateral spinothalamic tract carries what type of sensory information

pain, itch, temperature

25

what kind of receptors does the spinothalamic tract utilize

free nerve endings and thermal recpetors

26

what type of fibers does the lateral spinothalamic tract utilize

alpha-gamma nad C fibers (fast and slow)

27

first order neurons of the spinothalamic tract ascend in what tract

dorsolateral tract of lissauer --> ascend/descend 1-2 levels and synapse

28

second order neuron cell bodies in the lateral spinothalamic tract are found where

in the dorsal horn
they go on to decussate in the anterior white commissure and ascend