Lecture 21, Ch. 48 - Lecture#21 Date s Chapter 48 ~ Nervous...

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Lecture #21 Date ______ Chapter 48 ~ Nervous System
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Nervous systems Effector cells~ muscle or gland cells Nerves~ bundles of neurons wrapped in connective tissue Central nervous system (CNS)~ brain and spinal cord Peripheral nervous system (PNS)~ sensory and motor neurons
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Structural Unit  of Nervous System Neuron~ structural and functional unit Cell body~ nucelus and organelles Dendrites~ impulses from tips to neuron Axons~ impulses toward tips Myelin sheath~ supporting, insulating layer Schwann cells~PNS support cells Synaptic terminals~ neurotransmitter releaser Synapse~ neuron junction
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Simple Nerve Circuit Sensory neuron: convey information to spinal cord Interneurons: information integration Motor neurons: convey signals to effector cell (muscle or gland) Reflex: simple response; sensory to motor neurons Ganglion (ganglia): cluster of nerve cell bodies in the PNS Supporting cells/glia: nonconductiong cell that provides support, insulation, and protection
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Neural signaling, I Membrane potential
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