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5 Nervous System 2 Components

5 Nervous System 2 Components - 50 µm xon Schwann cell...

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The Nervous System I. Overview of the nervous system II. Components of the nervous system A. Neurons B. Glial Cells III. Membrane Potentials V. Signaling via membrane potential changes A. Graded potentials B. Action potentials VI. Synapses and Neurotransmitters VII. Postsynaptic Potentials and Integration
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Fig. 48.4 - Neuron Structure Dendrites Stimulus Nucleus Cell body Axon hillock Presynaptic cell Axon Synaptic terminals Synapse Postsynaptic cell Neurotransmitter
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Fig. 48.5 Dendrites Axon Cell body Sensory neuron Interneurons Portion of axon Cell bodies of overlapping neurons 80 µm Motor neuron Structural Diversity of Neurons
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Figure 49.6b Astrocytes Glial Cells Figure 48.12 Schwann cells and the myelin sheath (b) Astrocytes (LM)
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Unformatted text preview: 50 µm xon Schwann cell Myelin sheath Nodes of Ranvier Node of Ranvier Schwann cell Nucleus of Schwann cell Layers of myelin Axon 0.1 µm More Glial Cells Fig. 49.6a Oligodendrocyte Microglial cell Schwann cells Ependy-mal cell Neuron Astrocyte CNS PNS Capillary (a) Glia in vertebrates VENTRICLE How do neurons communicate? Dendrites Stimulus cleus Cell body Axon hillock Presynaptic cell Axon Synaptic terminals Synapse Postsynaptic cell urotransmitter Between neurons: • Electrical synapses • Chemical synapses Within a neuron: • dendrites to cell body (electrical) • cell body to axon terminals (electrical) {...
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