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प्रश्न
Briefly describe the structure of the cerebrum in the human brain, and mention its functions.
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उत्तर
Brain consists of main three parts and lies in the cranial cavity of the skull.
- The cerebrum
- The cerebellum
- The medulla oblongata
Cerebrum: It is very large and forms two-third of the whole brain. The two hemispheres are separated from each other by a deep longitudinal groove, the median fissure. The outer surface is folded with ridges and grooves. The hemispheres are hollow from inside and their walls have outer and inner portions. The outer portion has cell bodies of the neurons and it is called grey matter.
The wavery edges of the folded layer have a large number of neurons to the extent of nine billion. The inner portion of the cerebrum has axons and it is called white matter.
Functions:
- It controls all the voluntary activities.
- It is the seat of intelligence, consciousness, and will power.
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संबंधित प्रश्न
Differentiate between voluntary and involuntary movements.
Name the three components of a neuron (or nerve cell).
What is a neuron?
The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.
(a) What are cells A?
(b) What is the name of (i) branch B, and (ii) branches C?
(c) What is the microscopic gap D known as?
(d) What is the function of cells like A in the human body?
(e) The cells A are of three types. name the three types.
Fill in the blank:
The coloured part of eye is called _______.
Describe the two parts of the nervous system.
Select the odd one in the following series:
Parasympathetic, Sympathetic, Cranial nerve.
Draw a well-labeled diagram of a Neuron.
Describe the functional areas of Cerebrum.
______ is also known as duct of Sylvius.
