01:119:116 Lecture Notes - Lecture 18: Peripheral Nervous System, Central Nervous System, Spinal Nerve
4 Nov 2018
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Sense and react prokaryotes bya: increases chances of survival & reproduction in changing environment. Increase in body complexity increase nervous system complexity. I: cnidarians, simplest animals with nervous systems, no central control organ, nerve net- interconnected nerve cells. Pns: nerves and ganglia: nervous system and lifestyle ( f, g) Glial cells (glia: adult glial cells, ependymal cells, line cavities of cns, cilia- circulate cerebrospinal fluid, astrocytes. In cns a: dilate blood vessels near active neurons. Increase oxygen + glucose: regulate cns fluid composition. Ions + neurotransmitters: stimulate endothelial cells in blood vessels to form tight junctions. In cns a: pm rich in myelin (lipid) Electrical insulation: microglia, near blood vessels in cns b) In pns a: pm-myelin, sheath around axons. Newly formed neurons migrate from neural tube along tracks. Central nervous system (cns: brain ( fig 49. 5, gray matter- unmyelinated, white matter- myelinated, ventricles (cavities, cerebrospinal fluid- supplies nutrients and hormones, removes wastes, spinal cord.
