Question

A thin vascular membrane of the brain is known as
A.Archnoid
B.Piamater
C.Duramater
D.Epineurium

Answer 1

Hint:
A complex nervous system is found in Animals. The nervous system is classified into the central nervous system (CNS), autonomic nervous system (ANS), and peripheral nervous system (PNS). The brain is covered with three membranes known as meninges whose main function is to protect the brain and spinal cord.

Complete answer:
CNS constitutes the brain and spinal cord. The brain is covered with three membranes namely dura mater, arachnoid, and pia mater. The dura mater is the outermost meninges layer while the Pia mater is the inner innermost layer of the meninges.
The pia mater is a thin vascular membrane that closely follows the contour of the brain. It does not locate on the surface of the brain directly but rather it is separated from it by a thin space. This thin space is known as the subpial space that is formed by the end feet of astrocytes. Many superficial blood vessels of the brain are related to the pia mater. As it is a very thin membrane, these blood vessels are partially embedded within the thickness of the pia, while partially suspended by the arachnoid trabeculae.
Pia mater in some parts of the ventricles forms invaginations. These invaginations are lined by a plexus of specialized cells that are responsible for the production of cerebrospinal fluid. The cerebrospinal fluid helps in the protection of the brain and spinal cord.
Hence the correct answer is Piamater

Option ‘B’ is correct

Note:
The main function of the pia meter is to protect the central nervous system. In addition, it also separates the neural tissue from the blood vessels that are present in the subarachnoid space.