01:119:116 Lecture Notes - Lecture 18: Metencephalon, Autonomic Nervous System, Brainstem
30 Apr 2017
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Lecture 18 - nervous system organization: nervous system organization, cnidarians. Central control structure signals muscles: bilateria. Planarian - simple cns, brain, eyespot, ladder type nervous system. Annelids/arthropods - more complex, brain, ganglia: vertebrates. Nerves and ganglia = pns: nervous system & lifestyle. Glial cells (glia: types of adult glial cells. 5 types: ependymal, astrocytes, & microglia = support. Oligodendrocytes & schwann cells are myelinated (like insulation around the cells) Glial cells in adult develop from radial glia in embryo. Zika has been linked to death of neural progenitor cells like radial glia microcephaly. Link between the brain and rest of nerve system. Entire body: two functional components of pns. Controls what we are not aware of: Fight or flight : vertebrate brain, embryonic development. Anterior neural tube develops into brain regions. Fig 49. 11: comparison of vertebrate brains. Relative size of 3 main regions varies. Size reflects importance of particular functions: structures. Gray matter - cell bodies and dendrites.
