Exam 2 Spinal cord Flashcards Preview

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Flashcards in Exam 2 Spinal cord Deck (15):
1

How many spinal nerves exist?

31 pairs

2

Cord injury @ T1 level & below

Paraplegic

3

Cord injury @ C8 cord level & above

Quadriplegic

4

Dorsal horn (gray matter)

sensory info.
-relayed through posterior horn

5

Lateral horn (gray matter)

Preganglionic autonomic cell bodies
- found @ T1-L2 & S2- S4 levels
- parasympathic

6

Ventral horn (gray matter)

motor info.
- axons into periphery
- supply skeletal muscles

7

Gray matter gross structure also known as:

Substantia Grisea

8

White matter gross structure is also known as:

Substantia Alba)

9

A ________ is a longitudinal bundle of white matter.

Funiculus

10

Central canal inferiorly expands in the conus medullaris as a:

Terminal Ventricle

11

Neurons that originate in the spinal cord or brain stem & extend fibers into the PNS to innervate somatic musculature

Lower Motor Neurons (LMN)

12

Neurons from higher brain centers that influence the so called lower motor neurons.

Upper motor neurons (UMN)

13

Corticospinal tract fibers are a good example of:

UMN

14

UMN that are involved with initiation of skilled voluntary movements. In the cord _____ fibers are coricospinals.

Pyramidal neurons

15

Complex UMN most originate in the brain stem & extend down the cord. As a general rule they influence posture, muscle tone, enhance reflexes & thus allow voluntary movements to be smooth & effective

Extrapyramidal neurons
"fine tune movements"
DO NOT have conscious control over