CSF and meninges surround the brain and spinal cord to provide cushioning and protection. Which structures are referred to here?

CSF and meninges surround the brain and spinal cord to provide cushioning and protection. Which structures are referred to here?

• A. CSF and Meninges
• B. Skull and Vertebrae
• C. Blood-Brain Barrier
• D. Cerebellum

Answer: (A)

Protective coverings and cushioning around the brain and spinal cord come from the meninges and cerebrospinal fluid. The meninges are three membranes—dura mater, arachnoid, and pia mater—that wrap around the CNS, providing a protective envelope and helping anchor the brain and spinal cord. Cerebrospinal fluid fills the spaces within and around the CNS, offering buoyancy to reduce the brain’s effective weight, cushioning against impacts, and helping maintain the chemical environment for neurons. The skull and vertebrae offer rigid protection as bone encasements, not the cushioning function described. The blood-brain barrier is a selective barrier at the level of blood vessels, not a cushioning system, and the cerebellum is a brain structure, not a protective covering. So the structures referred to are CSF and meninges.

Protective coverings and cushioning around the brain and spinal cord come from the meninges and cerebrospinal fluid. The meninges are three membranes—dura mater, arachnoid, and pia mater—that wrap around the CNS, providing a protective envelope and helping anchor the brain and spinal cord. Cerebrospinal fluid fills the spaces within and around the CNS, offering buoyancy to reduce the brain’s effective weight, cushioning against impacts, and helping maintain the chemical environment for neurons. The skull and vertebrae offer rigid protection as bone encasements, not the cushioning function described. The blood-brain barrier is a selective barrier at the level of blood vessels, not a cushioning system, and the cerebellum is a brain structure, not a protective covering. So the structures referred to are CSF and meninges.