Billions of nerve cells called neurons, interconnected to form a communication network in the body known about the nervous system. Neuron is the basic unit of the nervous system. Nouron elongated thin shape and deliver pulses of electricity to function, called nerve impulses.Neuron cell body is not much different from other cells. Neurons have many branches at the ends of his called dendrites, which receive the impulse of duty in the surrounding neurons. He also had axon or long nerve fibers, which function to deliver the nerve impulses to other nouron or to a muscle. Neurons are separated by a side by side in the narrow gap called the synapse. When he arrived at the end of the axon, a channel impulse impulse generating chemicals. Sensory and motor neurons carry nerve impulses to the brain and from the brain and spinal cord (spinal cord). Neurons that is associative, numbering approximately 90% of all neurons that build the nervous system, and is only found in the brain and spinal cord.
Basically, the spinal cord is an extension of the brain. Reaches 45 inches in length, extends from the brain to the lower back. The nerves along the spinal cord, transmitting information between the brain and body. Spinal cord also plays a role in reflex. When someone touches a sharp object, nerve impulses arising from the fingertips, leading to the spinal cord immediately ordered that the muscles of the upper arm immediately pulled his fingers from the sharp objects.
The human brain consists of at least 100 billion neurons. Each neuron communicates with thousands of other neurons, thus forming a network of communication and control very complex. The brain receives information about the conditions inside and outside the body, processing and storing information and give orders based on what has been learned. Hypothalamus and brain stem control of automatic processes in the body such as breathing. Cerebellum (small brain) regulate smooth body movements. The left hemisphere and the right to control the mind, imagination, memory, words, emotions, sight, hearing, and sensing the smell, taste and touch.
The nervous system consists of two main parts of the brain and spinal cord, which forms the central nervous system or CNS (central Nervous System) and the nerves that form the nervous system PNS (Peripheral Nervous System). In the PNS sensory nerve channel of nerve impulses from sensory organs to the brain. Motor nerves of the brain's command channel. There are two kinds of motor nerve system. First, the somatic nervous system which is controlled consciously and stimulate muscles to contract framework. Second, belong to the nervous system ANS (Automatic Nervous System) which regulate the processes in the body such as breathing and digestion. ANS is divided into two, namely sympathetic and parasympathetic. How it works and the impact produced by the two against each other, so that the body still maintained in a stable condition.
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