CSF is produced by the choroid plexus in the ventricles. Which sequence correctly describes its flow from production to absorption?

CSF is produced by the choroid plexus in the ventricles. Which sequence correctly describes its flow from production to absorption?

• A. Produced by choroid plexus in the ventricles; flows from the lateral ventricles to the third ventricle, through the cerebral aqueduct to the fourth ventricle, into the subarachnoid space, and absorbed by arachnoid granulations into the venous sinuses.
• B. Lateral ventricles to the third ventricle to the fourth ventricle to the subarachnoid space to the arachnoid granulations to the venous sinuses.
• C. CSF is produced by brain parenchyma and absorbed by ependymal cells.
• D. CSF is produced in the choroid plexus and absorbed directly into the venous sinuses without passing through the subarachnoid space.

Answer: (A)

CSF flow follows a ventricle-to-subarachnoid-to-venous sinus pathway: it is produced by the choroid plexus in the ventricles, then moves from the lateral ventricles to the third ventricle through the foramen of Monro, down the cerebral aqueduct to the fourth ventricle, enters the subarachnoid space, and is finally absorbed into the dural venous sinuses via arachnoid granulations. This sequence matches the described route and absorption site. The other statements misstate either where CSF is produced or how it travels and is absorbed (e.g., production by brain parenchyma, absorption directly into venous sinuses without passing through the subarachnoid space).

CSF flow follows a ventricle-to-subarachnoid-to-venous sinus pathway: it is produced by the choroid plexus in the ventricles, then moves from the lateral ventricles to the third ventricle through the foramen of Monro, down the cerebral aqueduct to the fourth ventricle, enters the subarachnoid space, and is finally absorbed into the dural venous sinuses via arachnoid granulations. This sequence matches the described route and absorption site. The other statements misstate either where CSF is produced or how it travels and is absorbed (e.g., production by brain parenchyma, absorption directly into venous sinuses without passing through the subarachnoid space).