Question

Subdural space is between
A. Piamater and arachnoid
B. Arachnoid and dura mater
C. Piamater and grey matter
D. Grey matter and white matter

Answer 1

Hint: The organs of the central nervous system are protected by three coverings of the connective tissue. The space between the middle and the innermost membrane is filled with cerebrospinal fluid. The gap between the outer and the middle membranes is filled with interstitial fluid.

Complete answer:
Brain and spinal cord together make the central nervous system. Neurons are the structural and functional cells of the nervous system. The axons of the myelinated neurons are covered with the myelin sheath. Grey matter represents the areas of the central nervous system that contain the neuronal cell bodies and dendrites. On the other hand, the bundles of the myelinated axons make white matter.

The brain and spinal cord are covered with three protective coverings of connective tissue. These protective coverings are called meninges and include the dura mater, arachnoid mater, and the pia mater. Dura mater is the outermost meninx. It is the thick and strong covering made up of dense connective tissue. Arachnoid mater is the middle thin meninx composed of loosely arranged protein fibers. Pia mater is the innermost meninx that is attached to the surface of the brain and spinal cord. Subarachnoid space separates the arachnoid mater from the pia mater. The dura mater and arachnoid mater are separated from each other by a gap called subdural space.

Hence, the correct answer is option (B).

Note: The bony skull, three meninges, and the cerebrospinal fluid together protect the delicate brain and spinal cord. The meninges are separated from each other by space between them. For instance, subdural space and subarachnoid space are filled with interstitial fluid and cerebrospinal fluid respectively.