Question

Outer covering of brain is called as
A. Pleura
B. Menningers
C. Peritoneum
D. Perimetrium

Answer 1

Hint: The outer covering is three layered i.e., the outer layer is dura mater, middle is arachnoid mater and the innermost is pia mater. These are the layers of one outer covering.

Complete answer:
> First option given is Pleura and Pleura is a membrane which is a thin sheet of tissues. There are two types of pleura one is the inner pleura which is mainly lined on the surface of lungs and the outer pleura which is attached to the chest cavity. This membrane helps in breathing for expansion and contraction of lungs.

> Next is Menningers. There are three layers of meninges present around the brain and spinal cord. It consists of a tough outer layer dura mater, middle arachnoid mater and the innermost is pia mater which is tightly bound to the surface of the brain and spinal cord. It supports the blood vessels and helps to protect both the brain and spinal cord from mechanical trauma.

> Moving to Peritoneum, it is the membrane which lines the abdominal cavity to support the organs of the abdomen. There are two layers, the outer layer is attached to the abdominal wall and the inner layer is wrapped around the organs.

> Last is Perimetrium, the serous layer of uterus is called perimetrium. This is the outer layer which covers the uterus. It secrete fluid which helps to reduce the friction. So from all the options it is concluded that menningers is the outer covering of the brain.

Hence, The correct answer is option (B), Menningers.

Note: Meninges are three layered which covers the brain in order to protect it. The outermost layer dura mater is thick as it consists of two layers and it is closest to the skull and vertebrae. The middle layer arachnoid mater is thin and transparent, it is tightly packed and it forms arachnoid barrier. It supports the central nervous system. The innermost layer pia mater is very delicate. The capillaries of the pia mater nourish the brain as it is pierced by the blood vessels.