Central Nervous System - Central Nervous System evolution...

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Central Nervous System evolution of vertebrate brain - sponges are only multicellular animals w/o nerves cnidarians - have simplest nervous systems (nerve net) o no control/association flatworms - simplest animals w/ association in nervous system o bigger mass of nervous tissue (beginnings of brain) >> complex control interneurons/tracts added to brain as it evolved ( interneurons - complex, high-level neurons found in brain/spinal cord) hindbrain (rhombencephalon) - extension of spinal cord o coordinates motor reflexes o cerebellum (“little cerebrum”) - controls balance, body position o pons - controls automatic functions, links cerebellum/medulla oblongata w/ other parts of brain o medulla oblongata - contains respiration, circulation midbrain (mesencephalon) - consists of mostly optic lobes that receive/process visual information o controls eye/ear reflex forebrain (prosencephalon) - processes most of sensory information o diencephalons - thalamus, hypothalamus o thalamus
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