The ventricular system

Dr. Morton explains the brain's ventricular system, detailing the lateral, third, and fourth ventricles, and the cerebral aqueduct. He describes cerebrospinal fluid (CSF) production, flow, and drainage, emphasizing its role in cushioning and buoyancy. The choroid plexus produces CSF, which flows through the ventricles and subarachnoid space, eventually draining into the bloodstream via arachnoid granulations.

Which of the following is NOT a ventricle of the brain?

• Fourth ventricle

• Third ventricle

• Lateral ventricle

• Fifth ventricle

What is the primary function of the cerebral aqueduct?

• To produce CSF

• To connect the lateral ventricles

• To connect the third and fourth ventricles

• To drain CSF into the bloodstream

Where is CSF primarily produced?

• In the superior sagittal sinus

• In the arachnoid granulations

• In the choroid plexus

• In the cerebral aqueduct

Through which structure does CSF flow from the third to the fourth ventricle?

• Lateral aperture

• Cerebral aqueduct

• Interventricular foramen

• Median aperture

What is the role of arachnoid granulations in the CSF system?

• To store excess CSF

• To filter CSF into the bloodstream

• To connect ventricles

• To produce CSF

How often is CSF replaced in the human body?

• Every 8 hours

• Every 4 hours

• Every 12 hours

• Every 2 hours

What is the approximate volume of CSF in an adult?

• 150 milliliters

• 50 milliliters

• 300 milliliters

• 500 milliliters