Question

The correct sequence of meninges from inner to outer side is:
A.Dura mater, Pia mater, arachnoid membrane
B.Dura mater, arachnoid membrane, Pia mater
C.Arachnoid membrane, Dura mater, Pia mater
D.Pia mater ,arachnoid membrane, Dura mater

Answer 1

Hint: The meninges refer to the membranous coverings of the brain and spinal cord.The outer layer of meninges is called as Dura mater which is tough and thick. The middle layer of meninges is known as arachnoid and the innermost layer is called Pia mater.

Complete answer:
Central nervous system comprises the brain and spinal cord both is surrounded by the three protective membranes.These are dura mater, arachnoid mater-pia mater. The meninges are the membranous coverings of spinal cord and brain have major functions to provide a supportive framework for the cerebral and cranial vasculature. The meninges in the brain are responsible for protecting the brain and spinal cord. The tough dura mater is the outermost layer of the meninges, while the pia mater is the delicate inner layer that lines the brain and spinal cord. In order from the outermost to innermost layer, the meninges are: dura mater, arachnoid mater, arachnoid space, and pia mater. The arachnoid mater and subarachnoid space create separation and cushioning between the dura mater and pia mater.

Hence, the correct answer is option (D)

Note: The meninges consist of three layers of connective tissue that surround the central nervous system. Dura mater is the thick outermost layer and serves to partition the central nervous system and meninges from the rest of the body. Arachnoid mater is the loose middle layer with a web-like appearance and helps cushion and protect the central nervous system. Pia mater is the delicate inner layer that adheres to the surface of the brain and spinal cord, creating one final barrier.