Neuro Qs

Question 1

What supplies wernickes area an Brocas

Cranial nerve involvement

Answer 1

Superior temporal gyrus
Temporal (near parietal)
= Middle cerebral artery = anterior circulation

Broca’s = frontal = middle cerebral artery

CN = midbrain, pons and medulla, which are supplied by the posterior circulation.

Question 2

What structure produces CSF and where in the brain is it located. What path does CSF take from where it is formed to where it is reabsorbed?

Answer 2

• CSF is produced by the choroid plexus the majority of the choroid plexus is located on the walls of the lateral ventricles along the choroid fissure. Choroid plexus is also present in the roofs of the third and fourth ventricles.
(ependymal cells)

• The CSF travels from the lateral ventricles through the foramen of Munro to the third ventricle. The fluid then flows through the aqueduct of Sylvius (cerebral aqueduct) into the fourth ventricle where it drains out of the foramen of Lushka and Magendie into the subarachnoid space.

Question 3

From which intra and extra cranial structures can headache pain originate?

Answer 3

Pain can arise from the Meninges, head and neck muscles and cranial/spinal nerves. Although the brain itself does not have any pain receptors, the large blood vessels of the brain do carry sympathetic nerve fibers which may transmit pain.

Question 4

Internal carotid artery: How does it enter the skull

Answer 4

Enters the skull via the carotid canal then travels horizontally through the temporal bone to enter the cranium through the foramen lacerum.

Question 5

Which artery(s) supplies the visual cortex? How could the blood supply explain macular sparing?

Answer 5

Occipital love
= posterior cerebral arteries.
It is thought that the middle cerebral artery can supply part of the visual cortex which is one theory for the macular sparing that is apparent in some visual field defects.

Question 6

What are the constituents that comprise the basal ganglia?

Answer 6

The basal ganglia consist of the caudate nucleus, putamen and globus pallidus, amygdala

Question 7

Which brain structures constitute the Papez circuit and what is the main function(s) of this system?

Answer 7

The papez circuit consists of the hippocampus, fornix, mammillary bodies, cingulate gyrus, thalamus, singulum and parahippocampal gyrus.

The papez circuit is involved in memory, emotions or emotional memory

Question 8

How is CSF reabsorbed?

Answer 8

CSF is reabsorbed by the arachnoid villi located in the dural venous sinuses. Aggregations of arachnoid villi are known as arachnoid granulations.