Topic 19: Nervous System - PNS - Spinal nerves Flashcards

1
Q

How many pairs of spinal nerves do we have?

A
  • 31 MIXED nerves
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Name how many of each spinal nerves we have

A

8 cervical
12 thoracic
5 lumbar
5 sacral
1 coccyx

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Where do these spinal nerves exit?

A
  • intervertebral foramina except 1st, which exits between atlas and occipital
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Each nerve has 2 points of attachment to the spinal cord. Name these attachments

A
  • dorsal root
  • ventral root
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What neurons and cell bodies are in the dorsal root?

A
  • sensory
  • cell bodies in dorsal root ganglia
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What neurons and cell bodies are in the ventral root?

A
  • autonomic and somatic motor neurons
  • cell bodies in ventral or lateral horn
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the spinal nerve?

A
  • joining of dorsal and ventral roots
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What does the spinal nerve immediately divide into?

A

branches called rami

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the 3 rami?

A
  • dorsal rami
  • ventral rami
  • rami communicantes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what does the dorsal ramus do?

A
  • innervates skin and muscles of the back
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does the ventral ramus form?

A
  • thoracic nerves (T2-T12) or further branch and join up, forming nerve plexuses (nerve network)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Diagram of spinal nerve plexuses

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the function of the rami communicantes?

A
  • connects ventral ramus (spinal nerve) to sympathetic trunk
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does the rami communicantes contain?

A
  • autonomic nerve fibres (neurons)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly