Meninges, CSF and blood supply of brain

Question 1

Name the 3 meningeal layers from outside inwards.

Answer 1

Dura mater, Arachnoid, Pia mater.

Question 2

In between which 2 layers does CSF circulate?

Answer 2

Between the arachnoid and pia mater, in the subarachnoid space.

Question 3

Predict the likely consequences of haemorrhage into the subarachnoid space as a consequence of tearing of blood vessels.

Answer 3

It is a big space so can take a lot of blood. It takes a few days (usually) for sufficient blood to accumulate to raise intracranial pressure but when it does > intractable headache, nausea and vomiting, mental confusion and finally coma.

Question 4

Does the Circle of Willis function in a normal healthy individual?

Answer 4

Arterial circle may be incomplete and there is very little blood flow through the communicating arteries in normal individuals so the answer is probably no.

Question 5

Which artery supplies the visual cortex?

Answer 5

posterior cerebral arteries

Question 6

Which artery supplies the auditory cortex?

Answer 6

middle cerebral arteries

Question 7

Which artery supplies the motor cortex?

Answer 7

middle cerebral arteries

Question 8

Which part of the motor cortex is supplied by another artery? And which artery is it supplied by?

Answer 8

The part controlling the legs on the medial surface of each hemisphere

Supplied by the anterior cerebral arteries.