Lecture 18: Spinal Cord, White and Grey Matter, and Spinal Nerves Flashcards Preview

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Flashcards in Lecture 18: Spinal Cord, White and Grey Matter, and Spinal Nerves Deck (18):
1

Which neurotransmitter is used by a somatic efferent neuron?

- Acetylcholine

2

Where does your spinal cord start and end?

- Foramen magnum (big hole) ----> 1st Lumbar Vertebra (L1)

3

What is the conus medularis?

- Tip of spinal cord which is shaped like a tapered cone

4

What is the filum terminale?

- An extension of the conus medularis that extends to end of spinal cavity
- Anchors spinal cord

5

Spinal cord fits within a _____ that fits inside the spinal cavity. It is filled with _____

- Sack
- Spinal fluid

6

The spinal cord is ______ than the vertebral column. Because of this some spinal nerves need to exit _____ _____.

- Shorter
- Way down

7

What is the cauda equina?

- Spinal nerves exiting spinal cavity + vertebral column inferior to end of spinal cord

8

What makes up grey matter and where is it found?

- Collections of cell bodies in the brain/spinal cord

9

What makes up white matter and where is it found?

- Bundles of axons in the cerebral cortex + spinal cord

10

Afferent (sensory) information comes through the _____ nerve root.

- Dorsal nerve root (in the dorsal root ganglion)

11

Efferent (motor) information goes out through the _____ nerve root.

- Ventral nerve root

12

What are ventral and dorsal horns composed of?

- Grey matter

13

What are ventral and dorsal columns made up of?

- White matter

14

What would happen if there was a lesion in the left ventral horn?

- Paralysis in those muscles

15

What happens in the dorsal root ganglion? It contains thousands of ____ ____. Therefore thousands of ______. What type are they?

- Sensory (Afferent) information
- Cell bodies
- Neurons
- Unipolar neurons (one process that splits into input zone and output zone)

16

What happens to the spinal nerve once they leave the spinal column?

- Branches split into dorsal ramus, ventral ramus, + sympathetic ramus (autonomic)

17

Axons are covered in ____ which are bundled together to form a _____ which are covered with ______. These bundle with _____ to form a _____. Nerves are covered by ______.

- Endoneurium
- Fascicle
- Blood vessels
- Perineurium
- Nerve
- Epineurium

18

Bundles of axons in the CNS are called a _____.

- Tract