1A5 - CSF Dynamics

Question 1

Where is CSF produced?

Answer 1

By small arteries and arterioles in the leptomeninges and the choroid plexus

Question 2

How is CSF produced?

Answer 2

Through ultrafiltration of blood plasma through the choroid plexus and modified secretions from the epithelial secretory cells

Question 3

What is the course of the flow of CSF?

Answer 3

Lateral ventricle –> interventricular foramen –> third ventricle –> mesencephalic aqueduct –> fourth ventricle –> central canal (spinal cord) & lateral apertures (into the subarachnoid space)

Question 4

What are the three routes by which CSF can be absorbed from the subarachnoid space?

Answer 4

1) By the venules of the subarachnoid space
2) Into the venous sinuses of the brain (passing through invaginations in the wall of the sinus called arachnoid villi)
3) Lymphatic vessels of the cranial and spinal nerve roots

Question 5

What is structure A?

Answer 5

Third ventricle

Question 6

What is structure B?

Answer 6

Obex

Question 7

What is structure C?

Answer 7

Cerebromedullary cistern

Question 8

What is structure D?

Answer 8

Subarachnoid space

Question 9

What is structure E?

Answer 9

Central canal (spinal canal)

Question 10

What is structure F?

Answer 10

Fourth ventricle

Question 11

What structure is G?

Answer 11

Mesencephalic equeduct

Question 12

What structure is H?

Answer 12

Lumbar cistern

The lumabr cistern is the fluid space beyond the conus medullaris