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CNS > Descending Tracts Need-to-Know > Flashcards

Descending Tracts Need-to-Know Flashcards

1
Q

Is the Anterior Corticospinal Tract (Pyramidal or Extra Pyramidal)?

A

Pyramidal

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2
Q

Is the Lateral Corticospinal Tract (Pyramidal or Extra Pyramidal)?

A

Pyramidal

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3
Q

Is the Tectospinal Tract (Pyramidal or Extra Pyramidal)?

A

Extra Pyramidal

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4
Q

Is the Rubrospinal Tract (Pyramidal or Extra Pyramidal)?

A

Extra Pyramidal

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5
Q

Is the Vestibulospinal Tract (Pyramidal or Extra Pyramidal)?

A

Extra Pyramidal

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6
Q

Is the Reticulospinal Tract (Pyramidal or Extra Pyramidal)?

A

Extra Pyramidal

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7
Q

What Descending Tracts are Pyramidal?

A

The Anterior & Lateral Corticospinal Tract

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8
Q

What Descending Tracts are Extra Pyramidal?

A
  • Tectospinal
  • Rubrospinal
  • Vestibulospinal
  • Reticulospinal
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9
Q

What is the function of the Anterior Corticospinal Tract?

A

Initiate Axial Musculature

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10
Q

What is the function of the Lateral Corticospinal Tract?

A

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

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11
Q

What is the function(s) of the Tectospinal Tract?

A
  • Extrapyramidal postural reflex in the neck

- reflex enhancement w/ sight and auditory inputs

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12
Q

What is the function of the Rubrospinal Tract?

A

Muscle tone control primarily in contralateral hand and foot musculature.

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13
Q

What is the function of the Vestibulospinal Tract?

A

Maintains proper orientation in falling and enhances spinal reflex capability.

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14
Q

What is the function of the Reticulospinal Tract?

A

Heart, blood pressure, and respiratory rates and rhythms

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15
Q

Where does the Anterior Corticospinal Tract cross over?

A

Prior to termination in R.L. 7

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16
Q

Where does the Lateral Corticospinal Tract cross over?

A

pyramids of the M.O.

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17
Q

Where does the Tectospinal Tract cross over?

A

as they descend

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18
Q

Where does Rubrospinal Tract cross over?

A

Midbrain as they descend

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19
Q

Where does the Vestibulospinal Tract cross over?

A

Does not cross over

20
Q

Where does the Reticulospinal Tract cross over?

A

mostly UNCROSSED

21
Q

What cord levels is the Anterior Corticospinal Tract found?

A

Terminate by T6

22
Q

What cord levels is the Lateral Corticospinal Tract found?

A

Entire length of the cord

23
Q

What cord levels is the Tectospinal Tract found?

A

Terminates @ C4

24
Q

What cord levels is the Rubrospinal Tract found?

A

All levels

25
Q

What is the Main source of influence of the Anterior Corticospinal Tract?

A

Cerebrum

26
Q

What is the main source of influence of the Lateral Corticospinal Tract?

A

Cerebrum

27
Q

What is the Main source of influence of the Tectospinal Tract?

A

Cerebellum

28
Q

What is the Main source of influence of the Rubrospinal Tract?

A

Cerebellum

29
Q

What is the Main source of influence of the Vestibulospinal Tract?

A

Cerebellum

30
Q

Where does the Anterior Corticospinal Tract originate?

A

Motor Cortex (aka Post-Central Gyrus)

31
Q

Where does the Lateral Corticospinal Tract originate?

A

Motor Cortex (aka Post-Central Gyrus)

32
Q

Where does the Tectospinal Tract originate?

A

Superior Colliculus of the Tectum in the Midbrain

33
Q

Where does the Rubrospinal Tract originate?

A

Magnocellular region of Red Nucleus in Tegmentum of Midbrain

34
Q

Where does the Vestibulospinal Tract originate?

A

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

35
Q

Where does the Reticulospinal Tract originate?

A

Reticular Formation

36
Q

What Rexed Laminae are associated with the Anterior Corticospinal Tract?

A

7

37
Q

The Anterior Corticospinal Tract has ___% of Total Corticospinal Fibers.

A

5-15%

38
Q

The Lateral Corticospinal Tract has ___% of Total Corticospinal Fibers.

A

85-95%

39
Q

The Lateral Corticospinal Tract synapses in ___ then take a 2nd internuncial fiber to ____.

A

Rexed Laminae 7

Rexed Laminae 9

40
Q

Fibers exit the Lateral Corticospinal Tract thru the…

A

Lower Motor Neurons

41
Q

What cells are located in the Lateral Corticospinal Tract?

A

Giant Pyramidal (Betz) Cells

42
Q

What descending tract(s) may assume Corticospinal function if the Corticospinal Tract is damaged?

A

Rubrospinal and Reticulospinal

43
Q

What is the only descending tract to originate in the Medulla Oblongata?

A

Vestibulospinal

44
Q

What is the function of the Fasciculus Proprius Tract?

A

Spinal Reflexes

45
Q

What is the first tract to be myelinated in the fetus?

A

Fasciculus Proprius

46
Q

What is the tract located between Rexed Lamina 1 and the posterior lateral sulcus of the cord?

A

Dorsolateral Tract (Lissauer)

CNS (4 decks)

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