Information on the nervous system

Autonomic nervous system

The following is an overview of the functions of the nervous system as well as general data that allow us to better understand its structure and function . We definitely great design with which we are created .

A vast network of communications

The nerves that make up the peripheral nervous system comprise a vast communications network. This network serves only to transmit signals between the central nervous system and the muscles and glands. Corresponds to the central nervous system, consisting of the brain and spinal cord , analyze the information received and responses develop in line with it.

Similar to a computer

The nervous system is like a computer . Controls the entire body through the stimuli that continually lead their cables, nerves. You may receive thousands of data in one second from the various body parts and then integrate to give a response, which carried out the nerves of the peripheral nervous system.

The gap : synapses

The point at which two are placed in communication neuron called synapses , and corresponds to a neuron which separates especio follows . So it is a gap along which the chemical messengers responsible for transporting a nerve messages from other neurons .

The nerve and lead wire

The ribs are formed by the longest extensions of neurons , axons . These are grouped to form a beam that is known by the name of nerve fibers. Many of the nerves of the body have their nerve fibers coated with a sheath of myelin , a substance which triggers the transmission of nerve impulses.

Faster than a Formula 1 car

The conduction velocity of individual nerve impulses varies with the type of nerve fibers involved. Myelinated fibers in the central nervous system conduct impulses at a speed of 100 m / s , which represents about 360 km / h . So from head to toe on the nerve stimulus takes to get a hundredth of a second.

Caught in a web of wires

The nerves that make up the peripheral nervous system branch and form increasingly thin fascicles. These booklets are a tangle of fine nerve endings that are distributed to all organs and tissues of the human body to give and receive information.

Taking note of everything that happens

Sensory receptors consist of nerve endings or specialized cells that convert energy of stimuli into nerve impulses received . These sensory receptors are distributed throughout the body and are in constant activity. Recorded and transmitted to the nervous system any changes that may occur both inside and outside the body.

How many neurons?

The nervous system consists of more than ten billion neurons, their axons grouped in bundles , fibers and nerve conveniently isolated by layers of connective tissue or myelin .

Central and switchboard

The brain is the large central governing this intricate communication network is the nervous system. However, the nerves of a good part of the body do not reach the brain, but stop at the " unit " of the spinal cord . Bone performs a preliminary analysis of the sensations before sending them to the brain, and in some cases, like that of the reflexes can act independently of the brain .

A driver system return

The spinal cord acts as a two way street between the brain and peripheral nervous system. Through a series of ascending tracts informs the brain of the various sensations received . By descending tracts travel orders from the brain to the spinal nerves that make up the peripheral nervous system.

Together, but not mixed

The spinal nerves originate in pairs on both sides of the core. Contains motor fibers , designed to muscles and sensory fibers from the nerve endings in the periphery. Motor fibers originate from motor roots located in the anterior region of the spinal cord , while the information carrier fibers are grouped in roots that penetrate through the back bone .

Our relationship with the world

Cranial nerves govern much of the functions that connect humans with the outside world : vision , taste , hearing and smell. These four senses, which allow us to assess what is happening around us is under the control of the cranial nerves.

A nerve that causes mourn

We refer to the trigeminal nerve. It is divided into the whole sensitivity spread over the face , from the forehead to the teeth three branches. Injury to this nerve is known by the name of trigeminal neuralgia, and is very painful. We all know how painful is a dental condition that irritates the trigeminal nerve termination. Under control of trigeminal sensitivity are also the eyes and the functioning of the lacrimal glands .

I feel good, I feel bad

Through sensory nerve fibers information constantly flows into the central nervous system . Images and sounds , tastes and smells , tactile , thermal and painful impressions , and a set of sensations from the internal organs of which the individual is totally ignorant . The brain collects and processes this information, and its outcome will depend how humans feel .

I do not hear most things

Many activities of the human body occur without the individual being aware of them. Most of the sensations recorded in the nervous system within the body and much of the external impressions never reach consciousness. However, this continuous flow of impulses from the skin , muscles and organs is essential for the body to function normally.

Pain yes, but not too

The ability to feel pain is vital to humans . The painful sensations occur whenever there is an organ or tissue injury . They are like the sentinel that warns of the presence of danger, thereby forcing the body to react to delete it.

A shadow government

Many of the functions of the body , such as glandular secretions , cardiorespiratory activity, digestive processes or controlling body temperature, are governed by the autonomic nervous system. This system includes various nerve centers in the brain and spinal cord that connect through nerves to all organs of the body. The action of the autonomic nervous system is not perceived consciously.

Sympathetic and parasympathetic

The sympathetic and parasympathetic , the two branches that make up the autonomic nervous system , form a government in constant conflict . For every action there is a reaction of the sympathetic by parasympathetic opposite sign. This permanent dialectic steady state of the organism emerges .

Answer the call

The friendly act in situations of alarm. Pupil-dilating bronchi, increased heart rate and blood pressure , decreases secretions and the motility of the digestive tract . All this in order to prepare the body to meet the challenge that is presented .

Frenazo parasympathetic

Unlike the sympathetic, parasympathetic acts in moments of relaxation and rest. The parasympathetic and the pupil constricts bronchi, increases secretions and motility of the gastrointestinal tract, decreasing blood pressure and heart rate , and leads to a lifestyle more sedate .

Supplements for Nervous System

In particular the B vitamins are essential in the metabolism of the nervous system. Involved in protein synthesis and in the processes of nutrition , facilitating input of energy substances required nerves . Its deficiency manifests as tingling and loss of strength and coordination .

Leg crossed and tingling

The tingling is the impression you get when the nerve to the foot is compressed by staying too long with her legs crossed . The nerve compression causes your sensory fibers emit signals that are perceived by the brain as a tingling or "pins and needles " .

Nervous self-healing

Nerves have some capacity for regeneration. When the nerve retains its structural covers, as occurs in the case of crushing can autorreconstruir the damaged part. Nerve regeneration progresses every day 1-2 mm , which is between 9 and 18 cm after three months.

When communication is cut

Most of the signals that control the sensations and body movements are under the control of spinal nerves emerging from the spinal cord. If it is injured, the communication with the brain is interrupted . As a result , the entire area of the body ruled by the spinal nerves that are below the injury will be paralyzed.

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