nervous tissue (NT) is considered to be a structural element of the nervous system, originating from the brain and nerve endings ending.If we consider the structure of the nerve tissue, it may be noted that it consists of nerve cells called neurons associated auxiliary cells (neiroglii), and from fibers and endings in it also includes blood vessels and connective tissue.
Evolving from the ectoderm, NT forms the central nervous system.It cells are collected into groups, thus, there is the gray matter, the fibers are collected into bundles, forming a white substance.
Nervous tissue is characterized by conduction and irritability.Since entering the cell stimuli are converted into pulses, which will be made to the relevant organs, tissues or muscles.Cells HT process and store data and it can be removed from memory when needed.
neuron consists of a nucleus and its surrounding cytoplasm (perikaryon), where the mitochondria, ribosomes, Golgi apparatus, and stuff Nissl substance.Depart from it shoots, which are represented by two species.
1.Dendridy - on them the momentum is transferred to the cell body.They have a length of 0.2 microns.
2. Neuro (axon) - on it the momentum is transferred from the cell body.It ends ramifications forming connections with other neurons or tissue organs.
It should be noted that nerve cells can conduct impulses strongly in one direction.
nervous tissue has three types of nerve cells:
1.Afferentnye - generates a pulse.
2.Effektornye - encourage tissue of action.These include motor neurons and neurosecretory cells (involved in the process of regeneration).
3. Associative - form connections between nerve cells.
nerve fibers represent processes of neurons surrounded lemmotsitami.They are myelin and unmyelinated.Depending on their structure, they belong to the structure of a part of the nervous system.
nerve fibers terminate in special devices called nerve endings, with their help, the fibers are connected to the various elements of the tissues.The endings are of two types: affectors and synapses.Excitation of the first conductive fabric on the fiber, the second, on the contrary, from the fiber to the fabric.
also nervous tissue has glia, that is, the group of cells that are between neurons.These cells perform functions such as protective, secretory, demarcation, supporting and trophic.They are involved in carrying out the excitation of the fibers during their regeneration and degeneration.
Thus, considering the function of the nervous tissue, are the following: the production and conduct electrical signals, deposition and storage in memory of certain information, participation in the formation of behavior, thinking and emotions.
Thus, HT is a highly specialized type of tissue consisting of cells, fibers, endings and glia.The cells have a tendency to recognize the irritation excited by producing certain impulses and then transfer them.Due to this tissue is involved in the integration and correlation of adapting all systems and tissues of the human body.
It should be noted, when the nervous tissue has the disease, affects all the elements that are included in its composition.In this case, may occur pathological processes such as inflammation, swelling, or other malformations that can affect the human nervous system.Changes or loss of substances in the NT offset by the growth of connective tissue, or the development of cysts.
It should be noted that the nervous system in general consists of nervous tissue, and through which all processes are performed in the human body.