Labia Stretching Exercises

Nervous System - Introduction

The Nervous System is a set of body structure like that work together to meet a number of functions that are the result of a common condition, ie nerve impulse conduction.

bodies that constitute the nervous system are: spinal cord , medulla, pons, brainstem, cerebellum and brain.

The nervous system can be divided in two ways: topographical and functional.

A) Topographic Division :

This division corresponds to the location of the elements that constitute the nervous system, and there is a Central Nervous System and Peripheral Nervous System.

The CNS includes the brain called - cord, ie ranging from the brain to the bone all the bodies named above.

The SNP is composed of the different nerves which are distributed from the CNS to the whole organism.

B) Functional Division:

This division refers to the mode that has the nervous system to respond to a stimulus, because the response may be voluntary or involuntary; how to respond in the SN may depend on the will of the individual or independent of it.

In the first case the SN is called voluntary life or relationship, working directly under the action of the will, for example the fact of wanting to open or close the hand.

In the case of involuntary system is self-governing, why is also called autonomic or sympathetic to - nice, eg the movements of the heart or intestines.

We can open or close the hand at will (voluntary system), but we can not stop heartbeat just wish it (involuntary system)

both the CNS and PNS are the elements belonging to the two types: voluntary and involuntary. Therefore there: SNC's life and self-respect, and SNP of life and self respect.

bodies comprising the SN are made up of nerve tissue. The dyed nerve has two types of cells: the neuron and glial cells, the neuron is typical of SN cell and is responsible for transmitting nerve impulses, glial cells (astrocytes, glioepiteliales, oligodendrocytes and microglia) are elements that, inter alia, contribute to maintaining vital neuron. Nerve impulse transmission is through a functional and anatomical structure called synapse . From the anatomical point of view, neurons have a body and two types of extensions: one is the axons and dendrites others are . The nerve impulse runs through the dendrite to the body or soma celualr where the axon exits. When it reaches the end of the axon is a formation called telodendria, which contains various substances, among which we can mention the adrenaline and Acetyl - Hill. With the arrival of the nerve impulse, these substances are dumped abroad and acting as a bridge allowing the passage of nerve flow to a dendrite of another neuron. This mechanism is the synapse and consists of two poles: one axon or pre - synaptic and dendritic or other post - synaptic, is space between the two poles is called the synaptic cleft ; is where those substances are dumped.