CNS

Question 1

What are the 3 layers of the meninges?

Answer 1

1. Meninges: Connective tissue covering that protects the spinal cord and brain dura mater. Outer layer
2. Arachnoid mater: Middle layer
3. Pia mater: Inner layer

Question 2

Spaces within the meninges

Answer 2

-Epidural space: Space between the dura mater and the wall of vertebral anal subdural space. Space between dura mater and arachnoid space.
-Subarachnoid space: space between arachnoid and pia mater

Question 3

Define meningitis

Answer 3

-Inflammation of the meninges caused by bacteria and viruses

Question 4

Describe the appearance of the spinal cord

Answer 4

-Cylindrical mass of nervous tissue extending from the medulla of the brain to the first lumbar vertebrae.
-Length: Roughly 45 cm
-Width: 2cm at the widest

Question 5

Describe the cervical and lumbar enlargements

Answer 5

-Cervical: Roughly C4-T1
-Where nerves to the upper extremities arise
-Lumbar: Roughly T9-T12
-Where nerves to the lower extremities arise

Question 6

What is the conus medullaris?

Answer 6

-End of the spinal cord (Spinal cord taper into a cone shape)
- Inferior to lumbar enlargement

Question 7

What is the cauda equina?

Answer 7

-Collection of roots of the spinal cord that do not leave the vertebral column at the same level that they came in at. They exit further down the spine.
-“Horse’s tail”

Question 8

What is the filum terminale?