Lecture 8: Spinal Cord

Question 1

What 3 structures keep the nucleus pulpous from entering the spinal canal?

Answer 1

Dorsal annulus fibrosus
Dorsal longitudinal ligament
Intercapital ligament (T1-10)

Question 2

Where does the sympathetic neurons live in the spinal cord?

Answer 2

Thoracolumbar spinal cord

Question 3

How do the axons of sympathetic neurons get to the sympathetic trunk?

Answer 3

Communicating branch of the ventral nerve root

Question 4

How many cervical vertebrae are there?

Answer 4

7

Question 5

How many cervical spinal cord segments are there?

Answer 5

8

Question 6

How many thoracic vertebrae segments are there?

Answer 6

13 dog/cat

18 horse

Question 7

How many thoracic spinal cord segments are there?

Answer 7

13 dog/cat

18 horse

Question 8

How many lumbar vertebrae segments are there?

Answer 8

7 dog/cat

Question 9

How many lumbar spinal cord segments are there?

Answer 9

7 dog/cat

Question 10

How many sacral vertebra segments are there?

Answer 10

3 dog/cat–fused

4-5 large animals

Question 11

How many sacral spinal cord segments are there?

Answer 11

3 dog/cat

4-5 large animals

Question 12

What are the 4 functional divisions of the spinal cord?

Answer 12

C1-5, C6-T2, T3-L3, L4-S1

Question 13

What delineates the functional divisions of the spinal cord?

Answer 13

Cervical and lumbar intumescence

Question 14

What named nerve is required to be functional to support weight in the forelimb and hindlimb? What spinal cord segments do the originate from?

Answer 14

Radial nerve forelimb: C7, C8, T1 (T2)

Femoral nerve hindlimb: L4, L5 (L6)

Question 15

What does the dorsal spinal artery supply?

Answer 15

Dorsal funiculus and dorsal horn

Question 16

What do the branches of the ventral spinal artery supply?

Answer 16

Central branches: ventral and intermediate gray matter

Peripheral branches: ventral and lateral white matter