3.21 Spinal Region Lecture 1

Question 1

demarcation of peripheral nervous system

Answer 1

between DRG and rami (not encased in bone)

Question 2

What’s in the spinal region?

Answer 2

• spinal cord
• dorsal root
• ventral root
• spinal nerve (briefly)
• meninges

Question 3

Where does the SC run?

Answer 3

medulla » L1/L2

Question 4

What’s in the SC?

Answer 4

• cauda equina

- filum terminale

Question 5

cauda equina

Answer 5

long roots that exit L2-L5 spaces

Question 6

L2-L5 spaces

Answer 6

intervertebral foramina

Question 7

filum terminale

Answer 7

connection of SC to coccyx

Question 8

landmarks on anterior SC

Answer 8

• median fissure

- 2 anterolateral sulci

Question 9

median fissure for:

Answer 9

blood supply (2/3)

Question 10

anterior sulci for:

Answer 10

exiting ventral roots

Question 11

landmarks on posterior SC

Answer 11

• median sulcus

- 2 posterolateral sulci

Question 12

posterior median sulcus for:

Answer 12

blood supply (1/3)

Question 13

posterior sulci for:

Answer 13

entering dorsal roots

Question 14

spinal nerve =

Answer 14

all sensory and all motor for one SC segment

Question 15

Which of these is closest to the SC?

rootlets
roots
nerves

Answer 15

rootlets

Question 16

relationship between rootlets, roots, and nerves

Answer 16

• rootlets combine to form roots

- roots combine to form nerves

Question 17

Rexed’s lamina

Answer 17

histologically and funcionally distinct regions of the gray matter

Question 18

How many pairs of spinal nerves?

Answer 18

31

Question 19

What are the spinal nerves?

Answer 19

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

Question 20

naming of spinal nerve segments

Answer 20

named for intervertebral foramen they exit

i.e. T6 segment: exit T6 intervertebral foramen

Question 21

C1-C7 exit (above/below)

Answer 21

above

Question 22

C8-S6 exit (above/below)

Answer 22

below

Question 23

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

Answer 23

rami

Question 24

dorsal rami innervate

Answer 24

• paravertebrals

- overlying skin

Question 25

ventral rami innervate

Answer 25

musculoskeletal and cutaneous areas of

• limbs
• anterior lateral trunk

Question 26

white matter organized into:

Answer 26

columns (somatotopically arranged)

Question 27

gray matter organized into:

Answer 27

horns

Question 28

What are the gray matter horns?

Answer 28

• dorsal
• ventral
• lateral

Question 29

dorsal horn contains:

Answer 29

sensory cell bodies

Question 30

ventral horn contains:

Answer 30

motor cell bodies (largely LMN)

Question 31

lateral horn contains:

Answer 31

autonomic cell bodies (preganglionic cell bodies)

Question 32

Where are lateral horns located?

Answer 32

only in T1-L2