01:119:116 Lecture Notes - Lecture 18: Radial Glial Cell, Peripheral Nervous System, Schwann Cell
11 Jan 2020
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Lecture 18 - nervous system organization: nervous system organization, cnidarians. Don"t know where the stimulus came from but they know that they have been touched: sea star (echinoderms) They know where the stimulus came from. Platyhelminthes - simple cns, brain, eyespot, ladder type nervous system. Can sense danger and escape, can move towards light and away from light. Annelid/arthropods - more complex, brain and ganglia: vertebrates. Brain and spinal cord - cns (central nervous system) Nerves and ganglia - pns (peripheral nervous system) Squid - fast -> complex: nervous system & lifestyle, glial cells (gila, adult glial cells. Ependymal - causes spinal fluid to move and support the cerebrospinal fluid. Astrocytes - helps with blood flow to the neurons. Microglia - support for immune and defense. Oligodendrocytes & schwann cells are myelinated (like insulin around the cells) Forms tracks in developing embryo (scaffold for neurons)
