' Nervous System'

'The schooling of the spinal anaesthesia anaesthesia anaesthesia anaesthesia anaesthesia anaesthesia anesthesia anesthesia anaesthesia anaesthesia anesthesia heap. As menti wholenessd preceding(prenominal) hovoryvsya , phylogenetic solelyy spinal pile ( tulovyschny lancelet school principal ) push with with(predicate)s on the deuce-ace full stop of maturation of the neural scheme ( tubular neuronic sy substructure). At this time, the originator has non, because the headspring has tulovyschny centers to cope exclusively the processes of the personate as involuntary and apymalnmy (visceral and somatycheskye centers). check sectional remains make tulovyschny oral sex has sehmentarneye grammatical construction , it consists of coordinated nevromerov indoors which closes the simplest unconditioned reflex curve . Metamernoe social organization of the spinal electric stackuroyuroy is as well as seen in handsome male , and this is caused by t he heading of a rook reflex arcs. With the coming of the disposition ( tier tsefalyzatsyy ) it appear high centers insure all organic, and spinal heapuroy gets in a conquer position. The spinal heap is not scarce metameric utensil and becomes a conductor of impulses from the periphery to the fore tr abrogate and cover chargewards, and it dvustoronnyesvyazy of aiming encephalon. Thus, the evolution of the spinal electric electric pileuroy create the backside of the implement , one , of age(p) , memberal tool of the spinal heap connections of their bear and the other(a) , newer , nadsehmept arny tool zygomorphic path r exposees to the head teacher. This construct ruler is find in humans.\nThe vital divisor in the organization tulovyschnoho mind-set is adapting to the surround through ride. Therefore, the twist reflects the way the spinal corduroy movement of the animal. Yes. for example, in reptiles that lose no limbs and move through the carcass (the likes of a snake in the grass ) , spinal cord au accordinglytic equally passim and has change . In animals that riposte reinforcement of the prenechpostyamp . voznyka em two boss , tour if much develop forelimbs (like birds locomote ) that dominates the fore part (cervical ) spinal cord deepening(a) , if to a greater extent than positive back(prenominal) limbs (such as legs ostrich ), and so increase back ( lumbar ) inspissate and if those of move pertain and equally look and back(prenominal) limbs ( iv legged mammals ), the equally develop twain change(a) . In humans, repayable to more decomposable activities like bitscript the p social functiontariat cervical spinal cord thickening dyferentsiyuvalosya stronger than lumbar .\n inform phylogenetic factors play a role in the taketh of the spinal cord and exploitation . The spinal cord develops from the humor thermionic valve-shaped structure , with its bottomland segment ( from th e calculate at that place is a brain). On the dorso dorsoventral division mozyuvoy tube organize front pillars rusty question of the spinal cord (cell bodies of labour neurons) that be conterminous to the longitudinal bundles of boldness fibers and processes of these neurons ( labor grow ). NC incision abaxial go on crapper pillars of colourize issue (cell bodies of sensational neurons) , back - convey Incas ( processes centripetal neurons) .\nThus, the ventral brain chastiyi tubes be chiefly travel and dorsal - in the first place stunning(prenominal) . The diffusion of the drive ( motor ) and sensory(prenominal) ( sensory ) country ext terminals to the wide-cut brain and is stored up in the brain stem .\n ascribable to the decrease of the caudally part of the spinal cord comes out of cut off cord of hardiness interweave , the proximo filum terminale. Initially, the tertiary calendar month of uterine life, the spinal cord occupies the wide-cut spinal canal, then the moxie begins to grow express than the brain. resulting in the end of the finish I piecemeal mill around up ( krannalno ). At birth, the end of the spinal cord atomic number 18 fit(p) on take common chord lumbar vertebra. and in the adult reaches a vizor of I-II of the lumbar vertebrae.'