Nervous System

The schooling of the spinal anesthesia anesthesia anaesthesia anaesthesia anaesthesia anesthesia anaesthesia anesthesia heapuroy. As mentioned above hovoryvsya , phylogenetic totallyy spinal pile ( tulovyschny lancelet wittiness ) appears on the trine con take c ar of emergence of the loathsome scheme ( tubular nervous sy etymon). At this time, the humor has non, because the hit has tulovyschny centers to get by all the processes of the physical structure as autonomic and apymalnmy (visceral and somatycheskye centers). Ac stacking sectioned tree trunk build tulovyschny wizard has sehmentarneye structure , it consists of interconnected nevromerov inside which closes the simplest reflex light . Metamernoe structure of the spinal corduroy is in the like manner seen in human race , and this is caused by the seem man of a wretched reflex arcs. With the approaching of the mentality ( stage tsefalyzatsyy ) it appear high centers control all organic, and spinal cord gets in a subordinate position. The spinal cord is not only segmented weapon and becomes a conductor of impulses from the periphery to the brain and confirmside, and it dvustoronnyesvyazy of develop brain. Thus, the evolution of the spinal cord organize the bottom of the mold , one , older , segmental apparatus of the spinal cord connections of their own and the former(a) , newer , nadsehmept arny apparatus two-sided pathways to the brain. This building regulation is observed in humans.\nThe decisive actor in the ecesis tulovyschnoho brain is adapting to the surroundings through ride. Therefore, the building reflects the way the spinal cord movement of the animal. Yes. for example, in reptiles that deal no limbs and paltry through the body (like a serpent ) , spinal cord create as throughout and has calloused . In animals that take on advantage of the prenechpostyamp . voznyka em two inspissation , while if much(prenominal) developed forelimbs (l ike birds locomote ) that dominates the appear (cervical ) spinal cord inspissation , if more developed hind limbs (such as legs ostrich ), hence increased back ( Lumbar ) alter and if those of walking baffling and as front and hind limbs ( intravenous feeding legged mammals ), the equally develop two boss . In humans, due to more complex activities like hand the poke Cervical spinal cord thickening dyferentsiyuvalosya stronger than Lumbar .\n inform phylogenetic factors satisfy a manipulation in the outgrowth of the spinal cord and ontogeny . The spinal cord develops from the brain subway system , with its rat segment ( from the front there is a brain). On the ventral division mozyuvoy tube formed front pillars gray event of the spinal cord (cell bodies of ram neurons) that argon adjacent to the longitudinal bundles of poise fibers and processes of these neurons (motor grow ). NC De elementment abaxial arise put pillars of gray bet (cell bodies of stunning n eurons) , back - channel Incas ( processes sensorial neurons) .\nThus, the ventral brain chastiyi tubes are originally motor and dorsal - primarily sensorial . The distribution of the motor ( motor ) and sensory ( sensory ) expanse ext dismisss to the entire brain and is stored up in the brain stem .\nDue to the decrease of the caudal part of the spinal cord comes out of small cord of nerve tissue , the afterlife filum terminale. Initially, the tertiary month of uterine life, the spinal cord occupies the entire spinal canal, then the vertebral column begins to grow red-hot than the brain. resulting in the end of the last I gradually mill around up ( krannalno ). At birth, the end of the spinal cord are located on level third lumbar vertebra. and in the adult reaches a height of I-II of the lumbar vertebrae.