Physiology The Central Neruous §ustem www.cambodiamed.com CN$ www.cambodiamed.com Consists of: mm =) ne (lan Copyright © The MoGraw-Hill Companies, Inc Permission required for reproduction or display Corpus callosum _ ¢ Spinal cord Receives input from sensory neurons Cerebrum | Gyrus > \ e * A\ a = & al ` ss r A Ì Š Sulcus Pm h in Ì WW, £ -_ Directs activity of motor neurons Association neurons maintain homeostasis in Meninges | the internal environment ' Tentorium cerebelll Vế A Spinal cord- x =~ Central canal~ www.cambodiamed.com Cerebellum a = Ơ Â Groove appears in ectoderm to fuse to form neurol tube bụ 2oth day after conception Neural tube eventually forms the CNS ¢ During 5** week, modified: ¢ Forebrain: telencephalon and diencephalon ¢ Midbrain: unchanged ¢ Hindbrain: metencephalon and myelencephalon ¢ Part of ectoderm where fusion occurs becomes neural crest ¢ Neural crest forms ganglia of PNS www.cambodiamed.com Embrvwonic Deuelopment Copyright © The McGraw-Hill Companies, Inc Permission required for reproduction or display Three primary Wall Cavity /}(forebrain \ vesicles of idbrai imidbrain) \ cephalon \ / Rhomben| {| cephalon é (hindbrain) derivatives Walls ) KA HN Lateral @/ hemisphere ventricles ' Meten/ cephalon—4 cephalon —\-Thalamus Third Midbrain Aqueduct 77-Hypothalamus \ cephalon—{ ies: Cavities /“Ñ-ZàCerebral / TelenProsenf Ẩ\ aphalon — : Adult secondary vesicles ( ( Five \Pons “Cerebellum | Medulla oblongata Spinal cord ventricle Upper portion of fourth ventricle Lower! portion Embrvwonic Deuelopment ¢ Telencephalon grows disproportionately forming the hemispheres of the cerebrum ¢ Ventricles and central canal become filled with cerebral spinal fluid (CSF) ¢ CNS composed of gray and white matter ¢ Gray matter consists of neuron cell bodies and dendrites ¢ White matter (myelin) consists of axon tracts www.cambodiamed.com www.cambodiamed.com Cerebrum ¢ Only structure of the telencephalon ¢ Largest portion of brain (80% mass) ¢ Responsible for higher mental functions ¢ Corpus callosum: ¢ Major tract of axons that functionally interconnects right and left cerebral hemispheres www.cambodiamed.com Ce | e lor er mm (continued) Copyright © The McGraw-Hill Companies, Inc Permission required for reproduction or display Central sulcus Motor areas involved speeche (Broca's | ` Lateral sulcus II | ope Motor - “