Lecture Exam 1

Question 1

what is the choroid plexus and what does it do?

Answer 1

choroid plexus is formed by areas where the ependymal lining and the pia mater meet, capillaries along pia mater form choroid fissures that contain fenestrations (holes) along the capillaries that allow substances to escape the blood into the choroid plexus but are stopped by arrays of tight junctions between choroid epithelial cells, choroid plexus is responsible for making CSF
(diagram on L5S10)

Question 2

where is choroid plexus located?

Answer 2

choroid plexus is continuous through the inferior horn, atrium, to the body of the lateral ventricles and then into the interventricular foramen, there is no choroid plexus in the anterior or posterior horn of the lateral ventricles, also located along the posterior side of the 4th ventricle and roof of the third ventricle
(diagram on L5S9 & 12)

Question 3

what are the major subdivisions of the lateral ventricles and where are they located?

Answer 3

anterior horn, body, atrium, posterior horn, and inferior horn
(diagram on L5S4)

Question 4

how is CSF circulated through the brain?

Answer 4

heartbeat pumps CSF through ventricles starting in the inferior horn of the lateral ventricles and then flowing into the 3rd ventricle, then the cerebral aqueduct, 4th ventricle, and then to the rest of the brain

Question 5

how is CSF reabsorbed?

Answer 5

CSF is reabsorbed through arachnoid villi into the superior sagittal sinus where it is circulated throughout the blood