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Descending Tracts Need-to-Know Flashcards

(46 cards)

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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?

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A

Does not cross over

20
Q

Where does the Reticulospinal Tract cross over?

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A

mostly UNCROSSED

21
Q

What cord levels is the Anterior Corticospinal Tract found?

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A

Terminate by T6

22
Q

What cord levels is the Lateral Corticospinal Tract found?

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A

Entire length of the cord

23
Q

What cord levels is the Tectospinal Tract found?

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A

Terminates @ C4

24
Q

What cord levels is the Rubrospinal Tract found?

25
What is the Main source of influence of the Anterior Corticospinal Tract?
Cerebrum
26
What is the main source of influence of the Lateral Corticospinal Tract?
Cerebrum
27
What is the Main source of influence of the Tectospinal Tract?
Cerebellum
28
What is the Main source of influence of the Rubrospinal Tract?
Cerebellum
29
What is the Main source of influence of the Vestibulospinal Tract?
Cerebellum
30
Where does the Anterior Corticospinal Tract originate?
Motor Cortex (aka Post-Central Gyrus)
31
Where does the Lateral Corticospinal Tract originate?
Motor Cortex (aka Post-Central Gyrus)
32
Where does the Tectospinal Tract originate?
Superior Colliculus of the Tectum in the Midbrain
33
Where does the Rubrospinal Tract originate?
Magnocellular region of Red Nucleus in Tegmentum of Midbrain
34
Where does the Vestibulospinal Tract originate?
Deiters' Nucleus (lateral part of Vestibular Nucleus of M.O.)
35
Where does the Reticulospinal Tract originate?
Reticular Formation
36
What Rexed Laminae are associated with the Anterior Corticospinal Tract?
7
37
The Anterior Corticospinal Tract has ___% of Total Corticospinal Fibers.
5-15%
38
The Lateral Corticospinal Tract has ___% of Total Corticospinal Fibers.
85-95%
39
The Lateral Corticospinal Tract synapses in ___ then take a 2nd internuncial fiber to ____.
Rexed Laminae 7 | Rexed Laminae 9
40
Fibers exit the Lateral Corticospinal Tract thru the...
Lower Motor Neurons
41
What cells are located in the Lateral Corticospinal Tract?
Giant Pyramidal (Betz) Cells
42
What descending tract(s) may assume Corticospinal function if the Corticospinal Tract is damaged?
Rubrospinal and Reticulospinal
43
What is the only descending tract to originate in the Medulla Oblongata?
Vestibulospinal
44
What is the function of the Fasciculus Proprius Tract?
Spinal Reflexes
45
What is the first tract to be myelinated in the fetus?
Fasciculus Proprius
46
What is the tract located between Rexed Lamina 1 and the posterior lateral sulcus of the cord?
Dorsolateral Tract (Lissauer)

CNS (4 decks)

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