1-Central nervous system-
The central nervous system is the part of the nervous system that controls and regulates all the activities of multicellular animals. In vertebrates the nervous system is engaged in minigenes.
It includes most of the nervous system and the brain and spinal cord. The nervous system is located in the dorsal cavity, with the brain in the cranial cavity and the spinal cord in the spinal cavity. The brain is protected by the skull and the spinal cord by the bones. ,
The human brain is the control center of the central nervous system of animals. It regulates and controls their conduct. In mammals, the brain is located in the head and is protected by the skull.
It is located close to the main sense organs, connected to the eyes, nose, tongue and ears. The brain is present in all vertebrates, but in vertebrates it is in the form of a central brain or independent ganglia. In some organisms like cnidaria and star fish, it is not concentrated but spreads everywhere in the body.
Whereas some animals like sponges do not even have a brain. The brains of higher-order animals such as humans are extremely complex. The human brain contains approximately 1 billion (1,000,000,000,000) nerve cells, each of which connects more than 10,000 (10,000) to other nerve cells.
The brain is the most complex organ. The functions of various parts of the body are controlled and regulated by the brain. Therefore the brain is called the master organ of the body. Its main function is to control and regulate knowledge, intelligence, reasoning power, memory, thought judgment, personality etc.
The field of neuroscience is developing very rapidly all over the world. The need to consider the entire field in terms of brain function at the molecular, cellular, genetic and behavioral levels has been fully realized to deal with a wide range of neurological diseases.
A new study has concluded that brain size may reflect personality. In fact, children are born as a different personality and as their brain develops, their personality is also prepared accordingly. The brain is located in the skull.
It is the seat of consciousness and memory. The impulses from all the sense organs – eye, ear, nose, tongue and skin – come here, to understand which means to acquire knowledge is the work of the brain.
The main centers of sending impulses through the nerves to trigger the contraction of muscles and regulating those actions are in the brain, although these actions keep happening from different centers located in the spinal cord. The work of collecting the knowledge gained from experience, considering and drawing conclusions after considering it is also the work of this part. ,
The basic unit of the nervous system. all of the nervous system cells Neurons are involved. Neurons are neural processes that have “finger-like” projections that extend from the nerve cell body. Neural processes consist of axons and dendrites which are capable of conducting and transmitting signals.
Axons normally carry signals from the cell body. They are long neural processes that can be branching to convey signals to different regions. Dendrites generally point to the cell body. They are usually smaller in number and more branched than axons.
Axons and dendrites are grouped together into what are called nerves. These nerves send signals between the brain, spinal cord, and other body parts through nerve impulses. Neurons are classified as either motor, sensory, or interneurons.
Motor neurons carry information from the central nervous system to organs, glands, and muscles. Sensory neurons send information to the central nervous system from internal organs or from external stimuli. Interneurons relay signals between motor and sensory neurons.
Read in Hindi: Central nervous system-