Question

Lining of brain ventricle and central canal of spinal cord is called as
A. Ependyma
B. Endothelium
C. Mesothelium
D. Neurosensory

Answer 1

Hint: There are majorly four types of tissues in an animal body. They are named as epithelial, connective, muscular and nervous tissue. Among these, the epithelial tissue is responsible for the covering and the linings of the surfaces of the body. Epithelial tissue provides mechanical and functional protection to the surface by lining it. The human brain is an essential and delicate organ, thus it is to be protected by several layers. Epithelial tissue also provides linings to the human brain.

Complete answer:
The human brain consists of forebrain, midbrain, and hindbrain. The forebrain consists of cerebral cortex, diencephalon, thalamus, hypothalamus, epithalamus and subthalamus. Midbrain consists of colliculi and cerebral peduncles. Hindbrain consists of pons, medulla and cerebellum.
The human brain is a hollow structure from inside. The hollow compartments of the human brain are called brain ventricles. There are a total of four ventricles inside the human brain. These are named as lateral ventricles, third ventricle and the fourth ventricle.
The two lateral ventricles are present in the cerebral hemispheres. The third ventricle is the cavity of the diencephalon and the fourth ventricle is the cavity of the hindbrain. The cavity of the spinal cord is called a central canal
These ventricles are lined by epithelial tissue. This epithelial tissue is a specialised epithelial tissue as it is secretory in nature. The cells of the brain epithelium tissue are called ependymal cells and the layer is called ependyma.

Hence, the correct answer is option (A).

Note: Human brain produces a specialised fluid called cerebrospinal fluid or CSF. The ependymal cells of the brain secrete CSF and it acts as a shock absorber. CSF travels through lateral ventricles towards the third ventricle and from the third ventricle, it drains into the fourth ventricle. The ventricles are interconnected through the different foramina.