Cerebrospinal Fluid is Formed from Blood by Clusters of Capillaries

Question

Cerebrospinal fluid is formed from blood by clusters of capillaries in the brain known as ________.
A) choroid plexuses
B) arachnoid villi
C) ventricles
D) sinuses

Accepted Answer

Choroid plexuses are clusters of capillaries in the brain that filter blood plasma to produce cerebrospinal fluid (CSF). CSF then circulates through the ventricles of the brain and around the spinal cord, providing nutrients and cushioning for neural tissue. Arachnoid villi are small projections from the arachnoid meningeal layer that allow excess CSF to be absorbed back into the blood, ventricles are cavities in the brain lined with ependymal cells, and sinuses are spaces within the skull that drain venous blood.