BY 108 Chapter Notes - Chapter 20: Postcentral Gyrus, Medulla Oblongata, Occipital Lobe
Document Summary
Evolution of vertebrate brain - sponges are only multicellular animals w/o nerves. Cnidarians - have simplest nervous systems (nerve net) No control/association flatworms - simplest animals w/ association in nervous system. 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 inread invented by teads. Cerebellum ( little cerebrum ) - controls balance, body position. Pons - controls automatic functions, links cerebellum/medulla oblongata w/ other parts of brain. Midbrain (mesencephalon) - consists of mostly optic lobes that receive/process visual information. Controls eye/ear reflex forebrain (prosencephalon) - processes most of sensory information thalamus - relays info between spinal cord and cerebrum. Cerebrum (telencephalon) - dominant part of mammalian brain. Ascending tracts - carry sensory info to brain. Descending tracts - carry impulses from brain to motor neurons.
