Ch 48 Neurons - sensory input motor input sensory receptor...

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sensory receptor sensory input integration motor input effector
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Central Nervous System (CNS) brain brain spinal cord spinal cord Peripheral Nervous System (PNS) cranial nerves cranial nerves spinal nerves spinal nerves
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cell body dendrite Synapse axon Myelin sheath
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Schwann Cells Axon Nodes of Ranvier
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bipolar unipolar multipolar most abundant type in CNS Dorsal root ganglion cells
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sensory receptors sensory neuron interneuron motor neuron effector
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A Simple Nerve Circuit – the Reflex Arc. A reflex is an autonomic response.
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Measuring Membrane Potentials. An unstimulated cell usually have a resting potential of -70mV.
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Ungated ion channels allow ions to diffuse across the plasma membrane. These channels are always open.
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The action potential is repeatedly regenerated along the length of the axon. An action potential achieved at one region of the membrane is sufficient to depolarize a neighboring region above threshold. Thus triggering a new action potential.
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This note was uploaded on 04/20/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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Ch 48 Neurons - sensory input motor input sensory receptor...

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