The structure and function of the brain in the central nervous system
The human brain
The central nervous system is composed of the brain and the spinal cord , the brain is a nerve block containing millions of the nerve cells ( the neurons ) and it is the main control center in your body .
The brain is located inside a bony box called the skull to protect it , It directs and coordinates all the processes ideas , the behaviours and the emotions , and it weights about 1.5 kg in the adult human .
The brain of the human consists of three main parts which are the cerebrum ( two cerebral hemispheres ) , the cerebellum and the medulla oblongata .
The cerebrum ( the two cerebral hemispheres )
The cerebrum is the largest part of the brain ? It is divided into two halves ( the right and the left ) called the two cerebral hemispheres , The cerebral hemispheres are separated by a fissure and attached to each other through the nerve fibres .
The outer surface of the two hemispheres is called the cerebral cortex and it is a grey matter , but the inner surface is called the white matter , The two hemispheres have many convolutions and folds on their surface .
The function of the cerebrum
The cerebrum is a very important part in the brain as it control the voluntary movements of the body such as running in the races , The cerebrum contain the centers of thinking and memory ( the concentration ) .
The cerebrum receive the nerve impulses from the sense organs ( the eyes , the ears , the nose , the tongue and the skin ) and send the suitable responses to these impulses .
The cerebellum lies at the back area of the brain below the two cerebral hemispheres , and it maintains the balance of the body during the movement .
The medulla oblongata
The medulla oblongata lies in front of the cerebellum , and it connects the brain with the spinal cord .
The function of the medulla oblongata
Damage to the medulla oblongata causes the death , and it is responsible for regulating the involuntary processes of the body as regulating the heartbeats .