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Flashcards in N34 Deck (28)
1

Corticofugal pathways

begin in layer V of cerebral cortices

2

Pyramidal system

voluntary movement; corticospinal and corticonuclear tracts; bineuronal; fast uninterrupted, non-modulated

3

Pyramidal system function

realization of movement; contralateral side (some bilateral)

4

Corticospinal tract

Layer V of MI, PMC, SMA, SI, PMA --> corona radiata posterior limb of IC --> middle crus cerebri --> pyramid

5

Lateral corticospinal tract (LCST) decussates

pyramidal decussation --> lateral funiculus (85%) --> activation of distal musculature neurons

6

Anterior corticospinal tract (ACST) decussates

ventral funiculus --> decussate at anterior white commissure at level of termination (15%) --> activation of axial musculature

7

Corticospinal tract receives input from?

MI, SI, PMA, PMC, and SMA

8

Corticonuclear tract receives input from?

MI, SI, PMA, PMC, and SMA

9

Corticonuclear tract synapses on?

CN nuclei 3-7, 9-12

10

Corticonuclear tract path

posterior limb of IC --> middle crus cerebri --> fibers terminate has they descend through midbrain (3,4) pons (5,6,7) and medulla (9,10,11,12)

11

Corticonuclear tract synapse

BILATERALLY except CN7 and CN12

12

Rubrospinal tract path

Red nucleus --> lateral funiculus --> LMN

13

Rubrospinal tract decussates

midbrain where is originates

14

Red nucleus receives input from

cortex (corticorubro fibers) ipsilaterally

15

Rubrospinal tract innervates

FLEXOR musculature (UE)

16

Lesion to the Rubrospinal tract only

can still walk but unable to do fine movements

17

Lateral Vestibulospinal tract path

lateral vestibular nuclei--> ventral funiculus --> ventral horn (bilateral)

18

Lateral Vestibulospinal tract (LVST) function

postural; primarily extensors of the LL

19

Medial Vestibulospinal tract path

medial vestibular nuclei --> MLF to cervical levels--> axial EXTENSOR musculature

20

Medial Vestibulospinal tract (MVST) function

posture and head movements

21

Lateral reticulospinal tract path

medullary reticular formation --> bilateraly in lateral funiculus --> EXTENSORS

22

Medial reticulospinal tract path

pontine reticular formation --> ipsilateral through ventral funiculus --> EXTENSORS

23

Tectospinal Tract path

Superior Colliculus --> decussates in midbrain --> reflex control of head and neck and eyes

24

MRST receives input from

ascending pathways

25

LRST receives input from

cerebral cortex

26

Which pathways carry info form the cerebral cortex?

RST, VST, LRST, MRST, TST, CST

27

extrapyramidal systems

control of a movement and its modulation (INVOLUNTARY) adjustment and synchronization

28

Extrapyramidal descendign pathways

are multisynaptic and enter reverberating circuits for extensive modulation of complex movement