3.21 Spinal Region Lecture 1 Flashcards Preview

7303 Neuroanatomy > 3.21 Spinal Region Lecture 1 > Flashcards

Flashcards in 3.21 Spinal Region Lecture 1 Deck (32)
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1
Q

demarcation of peripheral nervous system

A

between DRG and rami (not encased in bone)

2
Q

What’s in the spinal region?

A
  • spinal cord
  • dorsal root
  • ventral root
  • spinal nerve (briefly)
  • meninges
3
Q

Where does the SC run?

A

medulla » L1/L2

4
Q

What’s in the SC?

A
  • cauda equina

- filum terminale

5
Q

cauda equina

A

long roots that exit L2-L5 spaces

6
Q

L2-L5 spaces

A

intervertebral foramina

7
Q

filum terminale

A

connection of SC to coccyx

8
Q

landmarks on anterior SC

A
  • median fissure

- 2 anterolateral sulci

9
Q

median fissure for:

A

blood supply (2/3)

10
Q

anterior sulci for:

A

exiting ventral roots

11
Q

landmarks on posterior SC

A
  • median sulcus

- 2 posterolateral sulci

12
Q

posterior median sulcus for:

A

blood supply (1/3)

13
Q

posterior sulci for:

A

entering dorsal roots

14
Q

spinal nerve =

A

all sensory and all motor for one SC segment

15
Q

Which of these is closest to the SC?

rootlets
roots
nerves

A

rootlets

16
Q

relationship between rootlets, roots, and nerves

A
  • rootlets combine to form roots

- roots combine to form nerves

17
Q

Rexed’s lamina

A

histologically and funcionally distinct regions of the gray matter

18
Q

How many pairs of spinal nerves?

A

31

19
Q

What are the spinal nerves?

A

C1-C8
T1-T12
L1-L5
S1-S6

20
Q

naming of spinal nerve segments

A

named for intervertebral foramen they exit

i.e. T6 segment: exit T6 intervertebral foramen

21
Q

C1-C7 exit (above/below)

A

above

22
Q

C8-S6 exit (above/below)

A

below

23
Q

After exiting the spinal column, what do spinal nerves split into?

A

rami

24
Q

dorsal rami innervate

A
  • paravertebrals

- overlying skin

25
Q

ventral rami innervate

A

musculoskeletal and cutaneous areas of

  • limbs
  • anterior lateral trunk
26
Q

white matter organized into:

A

columns (somatotopically arranged)

27
Q

gray matter organized into:

A

horns

28
Q

What are the gray matter horns?

A
  • dorsal
  • ventral
  • lateral
29
Q

dorsal horn contains:

A

sensory cell bodies

30
Q

ventral horn contains:

A

motor cell bodies (largely LMN)

31
Q

lateral horn contains:

A

autonomic cell bodies (preganglionic cell bodies)

32
Q

Where are lateral horns located?

A

only in T1-L2