Question

The arachnoid covers the
A. Spinal Cord
B. Optic capsule
C. Pia mater
D. None of the above

Answer 1

Human brain and spinal cord is protected by three membranes known as meninges. The three protective meninges are dura mater the outer layer, arachnoid the middle layer, and the pia mater the outer layer.

Step by step answer: Arachnoid is the middle meninges. It is made up of connective tissue. It covers the brain and the spinal cord. Arachnoid has many membrane projections called arachnoid granulations. Arachnoid granulation helps to transfer cerebrospinal fluid from the subarachnoid space to the dural venous sinuses. Space between the arachnoid and the pia mater is called subarachnoid space. The cerebrospinal fluid present in the subarachnoid space.
So, the correct option is (A), i.e., Arachnoid membrane covers the spinal cord.
Additional Information: Nervous systems are divided into two parts. CNS and the peripheral nervous system. The spinal cord and the brain are part of the CNS and the network of nerves throughout the body comes under the peripheral nervous system. The bundle of nerve tissue is called the spinal cord which connects the brain and the nerves of our body. The spinal cord helps in communication between the peripheral nervous system and the brain. The vertebral column protects the spinal cord. In the middle of the vertebral column, there is a hole for the spinal cord. The brain stem is the bridge between the spinal cord and the brain. It connects the brain to the spinal cord and transfers neuron signals from the spinal cord to the brain and brain to the spinal cord.

Note: Cerebrospinal fluid protects the brain and the spinal cord by absorbing shock. It also nourishes the brain tissue. The cerebrospinal fluid contains protein, glucose, chloride, and water. In Dural venous sinuses the cerebrospinal fluid reabsorbed in the venous system.