Questions: 7 Cerebrospinal fluid is produced by the a. dural sinuses. b. choroid plexuses. c. ventricles. d. meninges.

The answer is b: choroid plexuses.

Explanation for each option:

a. Dural sinuses: These are channels found between layers of dura mater in the brain that drain venous blood from the brain, but they do not produce cerebrospinal fluid (CSF).

b. Choroid plexuses: These are networks of cells located in the ventricles of the brain that produce cerebrospinal fluid. They filter blood to produce the CSF, which then circulates through the ventricles and around the brain and spinal cord.

c. Ventricles: These are cavities within the brain that contain cerebrospinal fluid, but they do not produce it. The choroid plexuses within the ventricles are responsible for the production of CSF.

d. Meninges: These are protective membranes that cover the brain and spinal cord, consisting of the dura mater, arachnoid mater, and pia mater. They do not produce cerebrospinal fluid.

In summary, cerebrospinal fluid is produced by the choroid plexuses.