Nervous System overview

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Presentation transcript:

Nervous System overview Department of Biology, WCU

Introduction Control and communication Functions Sensory (skin, temperature, pressure) Process and interpret (brain) Motor response (muscles, glands)

Organization CNS (brain, spinal cord) PNS (everything else) PNS Sensory (afferent) somatic fibers visceral fibers

Organization PNS ANS Motor (efferent) Sympathetic Parasympathetic SNS (voluntary) ANS (involuntary) ANS Sympathetic Parasympathetic

The neuron Structural unit Characteristics 1. Longevity 2. Cannot divide 3. High metabolic rate

Neuron structure Cell body Cell processes Nucleus (no centrioles) Cytoplasm with ribosomes and ER Cell processes cytoplasmic extensions

Neuron structure Processes 1. Dendrites 2. Axons receive information signals toward cell body 2. Axons vary in length impulses to next neuron

Impulse conduction Order of events Neuron etc. dendrite, cell body, axon, synapse

Neural processing 1. Serial “all or nothing” manner end-to-end e.g. quick reflex reflex arc

Neural processing 2. Parallel input from different pathways simultaneous processing e.g. baking a cake

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