Final answer:
The Correct answer is A.The inner layer of the meninges is known as the pia mater, the thinnest and most delicate layer that directly covers the central nervous system's surfaces, providing nourishment.
Step-by-step explanation:
The inner layer of the meninges is called the pia mater. The meninges are composed of three layers that cover and protect the central nervous system (CNS).
which includes the brain and the spinal cord. The dura mater is the thick, outermost layer that provides a strong protective sheath. The middle layer is the arachnoid mater.
which is a thin, cobweb-like structure that houses cerebrospinal fluid (CSF) in the subarachnoid space.
Directly adhering to the surface of the CNS is the pia mater, being the delicate, innermost layer that conforms closely to the brain's contours.
It is essential for providing a fluid barrier and housing the blood vessels that nourish the brain.