Ascending and Descending Pathways (Teach Sheet) Flashcards Preview

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Flashcards in Ascending and Descending Pathways (Teach Sheet) Deck (31)
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1

Nucleus proprius

Origin of spinal thalamic tract

2

Nucleus dorsalis of Clark

Origin of dorsal spinocerebellar tract

3

Dorsal Column Pathway

Meissner's
Pacinian
muscle spindles up fasciculus gracilus or cuneatus

synapse in nucleus gracilis or cuneatus

2nd order fibers cross midline (internal arcuate fiber) to synapse in the VPL, 3rd order fibers to post-central gyrus (312)

4

Spinal thalamic pathway

free nerve endings - synapse in nucleus propius, 2nd order fibers cross midline to form the tract proper in the "anterolateral funiculus," then synpase in VPL. 3rd order fiber rise to 312

5

Dorsal spinocerebellar tract

joint receptors, GTO's or muscle spindles send unconscious proprioceptive info to Clark's Nucleus, 2nd order fibers form the DSCT which travels in the outer portion of the lateral funiculus, up the inferior cerebellar peduncle, into the cerebellum (without crossing)

6

Ventral spinocerebellar tract

starts in intermediate gray of spinal cord, samples interneuronal activity, crosses in the cord, crosses in the superior cerebellar peduncle, enters cerebellum

7

Corticospinal tract

starts in area 4 of the pre-central gyrus, travels through posterior part of internal capsule, down through middle of cerebral peduncle, travels in medullary pyramids which decussate, course in the lateral funiculus, synapses on anterior horn cells and you move

8

Rubrospinal tract

red nucleus, crosses midline and travels with CST to synapse on anterior horn cells in cervical cord controlling flexion in large muscle groups

9

What does ALS kill?

anterior horn cells and CST

10

What is positive Rhomberg?

Syphilis (need eyes to stand with feet together)

11

Nucleus proprius

Spinal thalamic tract

12

Area 312

STT and DCP (not SCT because it ends up in cerebellum)

13

Area 4

CST (corticospinal tract)

14

Crossed in cord

STT, VSCT, and ACST

15

Medial lemniscus

dorsal column pathway

16

Nucleus dorsalis

dorsal spinocerebllar tract

17

VPM

(Spinal trigeminal)

18

Clark's nucleus

dorsal spinocerebellar tract

19

Pyramid

corticospinal tract

20

Crossed in medulla

CST, DCP

21

Medial and lateral motor nuclei

CST

22

IML

sympathetics

23

ICP

SCT, CCT, DSCT (VSCT uses SCP)

24

Summarize DCP.

relays proprioception, 2 point discrimination, and vibration to 312.

Second order neurons cross in the medulla - so lesions in the spinal cord produce ipsilateral effects

lesion in 312 or brainstem above sensory decussation produce contralateral defects

25

Summarize STT.

relays pain to brain (312). crosses in spinal cord so lesion in cord produce contralateral effects. Unilateral lesions above the cord would also produce contralateral deficits.

26

Describe CST.

starts in area 4. crosses in medullary pyramids and synapses on anterior horn cells, resulting in fine movements. lesions in cord produce ipsilateral deficits. lesions or strokes above the pyramids produce contralateral effects

27

Describe muscle spindles.

have intrafusal fibers, innervated by gamma fibers from the cord and respond to muscle stretch. GTO's respond to isometric tension increase

28

Describe Pacinian corpuscles.

have capsules, are rapidly adapting, and respond to vibration

29

Cerebellar deficits result in...

ipsilateral deficits (think CCT and DSCT)

30

DSCT shoots up...

inferior cerebellar peduncle