Question

Which layer in the cranial meninges is in contact with the brain tissue?

Answer 1

Hint:
The meninges are the three membrane structures that encircle the spinal cord and the brain and isolate them from the walls of their skeletal cases as the vertebral column and skull. Depending on their location, meninges are classified as the cranial meninges which encircle the brain, and spinal meninges which surround the spinal cord. However, the spinal meninges and cranial meninges are continuous with one other and consist of the same meningeal layers.

Complete step by step answer:
There are 3 layers of meninges which surround the brain and the spinal cord. These 3 layers from inside to outside are- pia mater, arachnoid mater and dura mater. From superficial to deep the three layers of meninges are dura mater, arachnoid mater, and pia mater. The cranial dura mater is the outermost layer of the meninges, comprises of thick irregular connective tissue. It has two layers; the superficial layer which is the periosteal cranial dura and the meningeal cranial dura.
The cranial arachnoid mater is a spider web-like layer, located between the dura and pia. In between the dura and the arachnoid mater, there is a space which is called the subdural space that contains a very thin layer of fluid. The potential space between the dura and arachnoid. The cranial pia mater is a vascular membrane that closely follows the outlines of the brain. It is not directly present on the surface of the brain, instead is separated from it in the subpial space. The pia meter is in contact with the brain tissue.
Hence, the correct answer is pia mater

Note:
In the subarachnoid space, the pia mater separates the neural tissue from the blood vessels. The effectiveness of the blood-brain barrier depends upon this ability of pia mater. It also degrades the neurotransmitters, thus preventing the prolonged impact of the neurotransmitters on the nervous tissue.
The role of the pia mater is to physically isolate the neural tissue from the blood vessels in the subarachnoid space, counting to the efficacy of the blood-brain barrier. Furthermore, it contributes to the degradation of the neurotransmitters, stopping their extended action on the nervous tissue.