Neuro11

Question 1

Where is CSF made?

Answer 1

Ependymal cells of Choroid Plexus

Question 2

Where is CSF reabsorbed?

Answer 2

Arachnoid granulations

- Drains into dural venous sinuses

Question 3

Where does the CSF go from the Lateral Ventricle?

Answer 3

3rd ventricle via:

-Right & Left Intraventricular foramina of Monro

Question 4

Where does CSF go from the 3rd ventricle?

Answer 4

4th Ventricle via:

-Cerebral Aqueduct (of Sylvius)

Question 5

Where does CSF go from the 4th ventricle?

Answer 5

Subarachnoid space via:

• Foramina of Luschka = Lateral
• Foramen of Magendie = Medial

Question 6

What are the types of Hydrocephalus?

Answer 6

Communication (Nonobstructive):
  -Communicating
  -Normal Pressure
  -Hydrocephalus ex vacuo
Noncommunicating (Obstructive):
  -Noncommunicating

Question 7

What causes communicating hydrocephalus?

Answer 7

DEcreased CSF absorption by arachnoid granulations

Question 8

What does communicating hydrocephalus lead to?

Answer 8

INcreased intracranial pressure
Papilledema
Herniation

Question 9

What does Normal pressure hydrocephalus result in?

Answer 9

INcreased Subarachnoid space Volume

NO increase in CSF pressure

Question 10

Normal pressure hydrocephalus involves expansion of the ventricles, that leads to what?

Answer 10

Distortion of the fibers of the Corona Radiata which leads to the Clinical Triad:

Urinary incontinence
Ataxia
Cognitive dysfunction

“Wet, Wobbly, Wacky”

Question 11

What is Hydrocephalous ex vacuo?

Answer 11

Appearance of INcreased CSF in atrophy
-observed on imaging - actually a result of decreased neural tissue (Alzheimer’s, Pick’s, advanced HIV)

*Intracranial pressure is normal – NO triad seen

Question 12

What causes Noncommunicating hydrocephalus?

Answer 12

Structural blockage of CSF circulation within ventricular system

(e.g., stenosis of aqueduct of Sylvius)