BIOL 205 Chapter Notes - Chapter 31: Schizophrenia, Central Canal, Dementia

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Chapter 31 textbook notes (chapter 28 in old version) Neurons- consist of cell body (containing nucleus and cell organelles), and neuron fibers that convey signals. Central nervous system (cns)- brain and spinal cord. Peripheral nervous system (pns)- nerves coming from cns, and ganglia (clusters of neuron cell bodies) Nerve- cable-like bundle of neuron extensions tightly wrapped in connective tissue. Sensory input- sensory neurons- conduction of signals from sensory receptors to integration centers. Integration- interneurons- interpretation of sensory signals and formulation of appropriate responses. Motor output- motor neurons- conduction of signals from integration center to effector cells. Effector cells- muscle cells or gland cells that perform the response. Dendrites- short, branched extensions that receive signals from other neurons, convey to cell body. Axons- long extensions that transmit signals to other cells (neurons or effector cells) Schwann"s cell- glial cell found in pns, wrapped around axon. Makes up myelin sheath (insulating material, ressembles oblong beads.

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