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The Neuron Dendrites Cell body (perikaryon, soma)

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Presentation on theme: "The Neuron Dendrites Cell body (perikaryon, soma)"— Presentation transcript:

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3 The Neuron Dendrites Cell body (perikaryon, soma)

4 Axon

5 Support cells (neuroglia) - more abundant than neurons - more mitotic capability

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7 Axon hillock

8 Gaps between Schwann cells called nodes of Ranvier axolemma

9 Myelinated axons: sheath of Schwann and myelin sheath one Schwann cell myelinates a single axon multiple Schwann cells needed to cover entire length of an axon

10 Oligodendrocytes myelinate CNS axons (if myelinated)

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12 Central Nervous System 1. brain 2. spinal cord - ganglia associated

13 3. axons project to and from the body (CNS  PNS) 4. cell bodies in CNS except some in ganglia

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15 Transmission 1. innervation - cell body as integrator 2. action potentials (impulses) - axon hillock 3. myelin sheath

16 Synapses - presynaptic terminal - postsynaptic terminal - neurotransmitters - ligand-gated ions channels on postsynaptic membrane

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18 Gap junction (nexus) - is an electrical synapse

19 Nervous System Organization of neurons 1. circuits for stimulus-response 2. exchange of information

20 Neuron signaling 1. afferent vs. efferent 2. interneurons 3. circuits

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33 Anencephaly

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35 Spina bifida occulta with meningocoele

36 Spina bifida with failure of neuropore closure

37 Cortical dysplasia

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