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Sensory Pathways Part 1 (APs) - Sensory Pathways I will...

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Sensory Pathways I will quickly review the following : 5. Temporal summation 1. Functional components of a neuron 2. Generation of Graded Potentials 3. Generation of Action Potentials 4. Chemical transmission at a synapse I will introduce the following concepts : 6. Spatial summation 7. Presynaptic modulation 8. Postsynaptic modulation
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Three Functional Classes of neurons – see Fig 8.4 1. Afferent (sensory) – transmitting information from PNS to CNS 2 . Efferent – transmitting information from CNS to PNS 3. Interneurons – entirely within CNS Function as integrators Make up the majority of neurons (99%) a. Neurons: make up the pathways: generate & transmit electrical signals b. Glial cells –traditionally thought of as support cells 1. Cells of the Nervous System
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a. Neurons - soma and long appendages ( dendrites and axons, collaterols). See Fig 8.2 Presynaptic (axon) terminals contain neurotransmitters Dendrites: receive and transmit information. Contain mechanical/ chemical gates . Axons (fibers): carry electrical signals to presynaptic terminals Collaterols: branch of an axon 2. Functional components of neurons
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Synapse - Junction between two neurons A presynaptic neuron is the neuron that comes before the synapse A postsynaptic neuron is the neuron that comes after the synapse See Fig 8.2 Terminology
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