all organs and systems of the human body are closely related, they are reacted with the help of the nervous system that controls all the mechanisms of life, from digestion and finishing process of reproduction.It is known that the human nervous system (NS) provides a link of the human organism and the environment.The unit of the National Assembly is a neuron which is a nerve cell that conducts impulses to other cells in the body.Connected in neural circuits, nerve cells form the whole system, both somatic and autonomic.
1.Somaticheskaya human nervous system regulates the musculoskeletal system, as well as supplies the skin.It controls the connection of the human organism and the environment, the movement of a person in space, work experiences and the development of skeletal muscle.
2. Vegetative coordinates the work of the National Assembly bodies and processes within the body without the will and consciousness of man.
structure of the nervous system:
1. Central National Assembly consists of the spinal cord and the brain, located in the bone cavity such as the skull and vertebral canal;
2. Peripheral.It consists of nerve plexus and endings of nerves and nodes located outside the skull and spinal canal.
spinal cord in structure resembles a tube filled with cerebrospinal fluid, consisting of white and gray matter.The brain has the back, middle and front parts, which departs from the auditory, visual and olfactory nerves.The brain has two cerebral hemispheres, brain stem and cerebellum.It consists of a gray substance forming the cortex and white matter.From brain as spinal and brain, waste mixed nerves that regulate metabolism in the body tissues.
Thus, the central nervous system is formed by the head brain, the spinal cord in passing, on the border is the brain stem.
Peripheral nerves extend from the spinal canal to parts of the body, such as the limbs or torso, thereby signaling to the central NA from the environment.
known that the human nervous system works on the principle of reflex, which aims to change the functioning of the organism under the influence of the external environment.When exposed to a particular stimulus, the nerve fibers occurs response of the body, so the human central nervous system communicates organs, tissues and blood vessels located in the body with the environment.
The functions of the National Assembly include:
- coordination of the activities of organs and systems, combining them into a complete organism;
- regulation of human interaction with its environment through the senses.
can say that NA is flexible because it can rebuild their job when there are changes of the human body needs.This mechanism is especially important in case of damage of one of the parts of the brain brain.
Since the human nervous system coordinates the work of all bodies of her defeat affects the activity of both adjacent and distant structures, and is accompanied by the failure of the functions of organs, tissues and systems of the body.Causes of the nervous system can be due to the presence of infection or poisoning of the body, in the event of a tumor or injury, diseases of the National Assembly, and metabolic disorders.
Thus, the National Assembly plays a man conducting a role in the formation and development of the human body.Thanks to the evolutionary improvement of the nervous system evolved psyche and consciousness of man.The nervous system is a vital mechanism of regulation of processes that occur in the human body
