What protects the CNS?

What protects the CNS?

• A. Meninges
• B. Skull
• C. Vertebral column
• D. CSF

Answer: (A)

The main idea here is that the CNS has layered protection, and the protective membranes directly surrounding it are the meninges. These three membranes—dura mater, arachnoid mater, and pia mater—wrap tightly around the brain and spinal cord, forming a protective sleeve. The dura is the tough outer layer, the arachnoid is a loose, web-like middle layer, and the pia adheres closely to the surface of the brain and spinal cord. Together, they cushion the CNS, help contain cerebrospinal fluid in the subarachnoid space, and act as a barrier against pathogens. The skull and vertebral column provide strong protective encasements as bones, which support and shield the CNS from external impact. Cerebrospinal fluid also plays a protective role by cushioning and buoying the brain, reducing its effective weight and helping to absorb shocks. However, the direct protective tissues surrounding the CNS are the meninges.

The main idea here is that the CNS has layered protection, and the protective membranes directly surrounding it are the meninges. These three membranes—dura mater, arachnoid mater, and pia mater—wrap tightly around the brain and spinal cord, forming a protective sleeve. The dura is the tough outer layer, the arachnoid is a loose, web-like middle layer, and the pia adheres closely to the surface of the brain and spinal cord. Together, they cushion the CNS, help contain cerebrospinal fluid in the subarachnoid space, and act as a barrier against pathogens.

The skull and vertebral column provide strong protective encasements as bones, which support and shield the CNS from external impact. Cerebrospinal fluid also plays a protective role by cushioning and buoying the brain, reducing its effective weight and helping to absorb shocks. However, the direct protective tissues surrounding the CNS are the meninges.