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CNS > Descending Tracts > Flashcards

Descending Tracts Flashcards

1
Q

Rubrospinal/Reticulospinal- Additional Notes

A

May assume corticospinal function if damage to corticospinal tract is damaged

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2
Q

Vestibulospinal- Origin

A

Deiters’ Nucleus (Lateral part of Vestibular Nucleus of M.O.)

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3
Q

Anterior Corticospinal- Source of Influence

A

Cerebrum

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4
Q

Rubrospinal- Decussation

A

Fibers cross in the Midbrain as they descend

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5
Q

Lateral Corticospinal- Source of Influence

A

Cerebrum

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6
Q

Anterior Corticospinal- Function

A

Initiate Axial Musculature

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7
Q

Anterior Corticospinal- Decussation

A

Mainly just prior to termination in Rexed Lamina 7

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8
Q

Lateral Corticospinal- Pyramidal/Extrapyramidal?

A

Pyramidal

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9
Q

Tectospinal- Decussation

A

Fibers cross as they descend

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10
Q

Tectospinal- Origin

A

Superior colliculus of tectum in the midbrain

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11
Q

Rubrospinal- Origin

A

Red Nucleus (Magnocellular region) in tegmentum of midbrain

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12
Q

Fasciculus Proprius- Notes

A

-Spinal reflexes -1st to be myelinated in fetus

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13
Q

Anterior Corticospinal- Origin

A

Motor Cortex (pre-central gyrus)

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14
Q

Lateral Corticospinal- Origin

A

Motor Cortex (pre-central gyrus)

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15
Q

Tectospinal- Function

A

-Trap/SCM, extrapyramidal postural reflex in neck -Reflex enhancement w/ sight and auditory inputs

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16
Q

Tectospinal- Cord Levels

A

-C.N. 11 -Terminate by C4

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17
Q

Reticulospinal- Decussation

A

Mostly uncrossed

18
Q

Reticulospinal- Function

A

-Heart -Blood Pressure -Respiratory rate/rhythms

19
Q

Vestibulospinal- Source of Influence

A

Cerebellum

20
Q

Rubrospinal- Source of Influence

A

Cerebellum

21
Q

Anterior Corticospinal- Cord Levels

A

Terminate by T6

22
Q

Vestibulospinal- Decussation

A

Fibers do not cross

23
Q

Anterior Corticospinal-Pyramidal/Extrapyramidal?

24
Q

Vestibulospinal- Function

A

-Extensor musculature -ipsilateral -fallling

25
Q

Rubrospinal- Function

A

-Flexor musculature -mainly hand and foot -contralateral if lesion occurs above cord -ipsilaeral if lesion occurs in cord

26
Q

Reticulospinal- Origin

A

Reticular Formation

27
Q

Vestibulospinal- Additional Notes

A

Only descending tract to originate in M.O.

28
Q

Rubrospinal- Cord Levels

29
Q

Anterior Corticospinal- Additional Notes

A

-5-15% of Total Corticospinal Fibers -Associated with Rexed Lamina 7

30
Q

Rubrospinal- Pyramidal/Extrapyramidal?

A

Extrapyramidal

31
Q

Lateral Corticospinal- Cord Levels

A

All levels

32
Q

TectoSpinal- Pyramidal/Extrapyramidal?

A

Extrapyramidal

33
Q

Lateral Corticospinal- Decussation

A

Mainly in pyramids of M.O.

34
Q

Vestibulospinal- Pyramidal/Extrapyramidal?

A

Extrapyramidal

35
Q

Tectospinal- Source of Influence

A

Cerebellum

36
Q

Reticulospinal- Pyramidal/Extrapyramidal?

A

Extrapyramidal

37
Q

Lateral Corticospinal- Additional Notes

A

-85-95% of total cortiocpinal fibers -Most synapse in rexed lamina 7 then take a 2nd internuncial fiber to rexed lamina 9 then exit via lower motor neuron Giant Pyramidal (Betz) Cells are Lateral Corticospinal Fibers (3%) synapse directly in rexed lamina 9

38
Q

Lateral Corticospinal- Function

A

Initiate precise, skilled, voluntary movements (mainly distal extremities)

39
Q

Vestibulospinal- Cord Levels

40
Q

Dorsolateral Tract (of Lissauer)- Notes

A

-Collateral fibers off posterior root axons -Located between rexed lamina 1 and the posterior lateral sulcus of spinal cord

CNS (5 decks)

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