Water on the Brain

Question 1

Internal hydrocephalus refers to “water on the brain”; what does it mean when hydrocephalus is “communicating”? / “Non-Communicating”?

Answer 1

Communicating means the passageways between ventricles are open / Non-communicating means that passageways btw ventricles are blocked

Question 2

Name 3 places that blockages can occur that then lead to NON-COMMUNICATING HYDROCEPHALUS

Answer 2

1) Foramen of Monro (Interventricular Foramen), 2) Cerebral Aqueduct (Aqueduct of Sylvia), 3) Foramina of Luschka and Magendie

Question 3

What is another name for the interventricular foramen? / Where is it located and what does it connect?

Answer 3

Foramen of Monro / Connects the two paired lateral ventricles with the 3rd Ventricle at the midbrain; contains choroid plexus

Question 4

If there is a blockage at the foramen of Monro, where will hydrocephalus be present?

Answer 4

In the lateral ventricles, but not in the 3rd or 4th

Question 5

What is another name for the cerebral aqueduct? / what type of blockage might be present / where would blockage cause hydrocephalus?

Answer 5

Aqueduct of Sylvius / Aqueductal Stenosis / lateral ventricles & 3rd ventricle, not 4th ventricle

Question 6

Where is the foramina of Luschkka and Magendie? / What is a blockage of the foramina of Luschka called? / where does it cause hydrocephalus?

Answer 6

Connects the 4th ventricle with the subarachnoid space / Dandy-Walker malformation / All 4 ventricles

Question 7

What are arachnoid vili?

Answer 7

Small protrusions of the arachnoid through the dura mater that protrude into the venous sinuses of the brain, and allow CSF to exit the sub-arachnoid space and enter the blood stream

Question 8

Describe a blockage in the arachnoid vili / in what ventricles does hydrocephalus occur? / what type of hydrocephalus?

Answer 8

CSF cannot be reabsorbed into the venous system / all ventricles are communicating but hydrocephalus occurs in all of them / Communicating

Question 9

COMMUNICATING hydrocphalus is not usually caused by _________________, but is rather usually caused by _______________ that blocks _____________________

Answer 9

Blockage / Bleeding / Resorption of CSF by arachnoid granulations (vili)