Center Nerve System

Center Nerve System Nerve center system consists on brain (encephalon) and spinal cord (medulla spinalis). a. Brain The brain is located in the head cavity protected by bone skull (cranium), brain membranes (meninges), and brain fluid (fluid cerebrospinal). The surface No equally Because exists hemispheres brain (lobe), bracelets brain (gyrus), And channelchannel brain (fissure). Brain differentiated on three part main, that is brain big (cerebrum), the cerebellum (cerebellum), and the brain stem (medulla oblongata). 1) Big Brain The cerebrum is part biggest from brain man, consists on two hemisphere cerebral Which separated by fissure longitudinal. Second hemisphere This connected by a number body fiber nerve called the corpus callosum. Through body here it is impulses continued from One hemisphere to hemisphere other. The hemisphere is divided into lobes- lobe, separated by gap Which called succulent. Every hemisphere consists on 4 lobe, between other: a) Lobe frontalis, is part front cerebrum until with sulcus middle. Its function control activity mentally And movement muscle. b) Lobe parientalist, located in between lobe frontalis And lobe occipitalis, its function as center sensation And talk. c) Lobe occipitalis, is part behind cerebrum Which works as center vision. d) Lobe temporalis, located in edge lower lobe parientalist And frontalis Which works as center nerve hearing. 2) Small Brain (Cerebellum) Small brain (cerebellum) located in lower from lobe occipitalis cerebrum. Part brain This divided two Left and right by fissure Which shallow. Brain small is center arrangement motion And balance body. On cerebellum front there is successor impulse from muscles part right And left body, called bridge Varol . Bridge Varol connect brain big And brain small. 3) Stem brain ( Medulla oblongata ) Medulla oblongata located in between cerebrum And medulla spinalis (marrow bone behind). Medulla This role as center regulator Respiratory, by transmitting nerve impulses that stimulate the muscles inter ribs (muscular intercostal) And diaphragm. Besides That, medulla oblongata role Also as center arrangement motion reflex beat heart, temperature body, And vaso dilatation or vaso constriction (widening or narrowing) vessels blood. Stem brain own parts: a) thalamus, located in part anterior from medulla oblongata And consists on two bulge side. b) The hypothalamus, located just below the thalamus and plays a central role maintenance balance dynamic body with control certain, for example lust Eat, Sleep, temperature body, And balance fluid body. c) Brain middle, is area narrow between thalamus And punch varoli, involved in reflexes visual certain. b. Marrow Bone Behind (Medulla spinalist) Marrow bone behind located in in channel sections bone behind (column vertebral), consists on thousand neurons (cell nerve), And shrouded by membrane wrapping (meninges). Marrow bone behind consists on two part, that is part gray in middle And part white in edge. Part gray shaped letter H, consists from root dorsal Which contain nerve sensory, root ventral Which contain nerve motor efferent, and the central canal, a channel containing cerebrospinal fluid relate with cavity ventricle in brain. Part white, surround part gray, containing fibers nerve spiral Which come from part gray, And fiber nerve throughout marrow bone behind Which connect nerve spinal with brain. Function marrow bone behind is as liaison impulse from or to brain And give possibility road shortest on motion reflex. Motion reflex is an unconscious response to certain stimuli. This reflex is mechanism important For look after normality function body. For example, cough And sneeze is reflex maintenance from disturbance system Respiratory. Reflexes Which simple only need most Lots three fruit cell nerve (neurons) For produce action to A excitatory that is neurons sensory interneurons motorist. Reflex can resolved through curved reflex, that is road shortest Which taken something motion reflex, like reflex jolt knee.