nervous central System
It is formed by the brain and the spinal cord, both structures are protected by three covering of connective textiles calls meninges: duramadre, aracnoides and piamadre, the marrow is inside the spinal column, whereas the brain remains shut up inside the skull. The internal part of the marrow is formed by the cellular bodies or somas of the neurons, the day pupil by the completions axónicas and dendríticas, the internal zone receives the gray name of substances and has form of a butterfly with widespread wings, the external zone of the marrow has whitish coloration (white substance), due to the axones mielínico of the neuron.
The brain usually distinguishes three zones: the previous brain, the way and the later one, the previous one is formed by the telencéfalo and the diencéfalo, the telencéfalo is formed by two hemispheres, which join in the so-called corny body, the hemispheres constitute the cerebral cortex, that as the spinal cord, gray and white substance is formed by substances. Sim impeded in the telencéfalo the gray substance it is in the external part while, that the gray this one is in the interior.
In the telencéfalo there can differ also several frontal, occipital, parietal lobes, the surface of the cerebral cortex is furrowed for cisura or convolutions, between which those of Silvio and Rolando are the deepest the cerebral cortex has basically coordinating functions, which influence the rest of the cerebral structures. In the crust sensitive zone exists or of sensory integration, zone motorboat or of coordination of the movement and the zones of affiliation that receive the signs of the previous ones.
| Section sagital average of the brain (continued caudalmente with 9: spinal cord). The visible part of the cerebral ventricle is colored of blue semitransparently: 1. Previous brain: 2. Telencéfalo (indicated the frontal lobe, and with attenuated vision of the temporary lobe), 3. Diencéfalo. 4. Trunk of the brain: 5. Mesencéfalo, 6. Node, 7. Bulb raquídeo. 8. Cerebellum. 9. Spinal cord, source of image of mastery of wikimedia commons, Author: Jmarchn | If to the brain he is deprived of oxygen during a few minutes, he begins to die, artery that pass for his surface and between the meninges supply it appropriately. The thickest and resistant of the meninges is the duramadre, low the aracnoides exists a space, which contains blood glasses and the liquid cefalorraquídeo, the piamadre is the most internal. |
The diencéfalo is an important center of regulation, in him he is, between other structures, the nuptial bed, the hyponuptial bed, the hipófisis and the optical quiasma, across the nuptial bed there happens most of the sensitive fibers proceeding from the recipients, the hyponuptial bed they join the hipófisis with the system nervous and it is one inside regulator of the temperature, of the sleep, of the famine and of great others more functions. The hipófisis is in the base of the brain and is formed by different cellular types, each of which segregates a specific hormone, in the optical quiasma, there cross the optical nerves, which come from each of the ocular balloons. The zone of the brain entrusted to integrate the light stimuli, is in the crust of two occipital lobes, the mesencéfalo or encela way is formed by the so-called stems cuadrigésmino, in the mesencéfalo the movement is controlled ocular and it has important functions in the analysis and response of the auditory stimuli.
In my following publication I will continue with the second part my reading partners.
Bibliographical source
MOBILIZATION OF THE NERVOUS SYSTEM for David S. Butler - 2002.
The essential thing in nervous system for Charlie Briar, Daniel Lasserson - 2004.
The Nervous System for Joelle Riley - 2006.
