Types of Neurons and Nerve Impulses. Parts of a Neuron Cell body Axon – nerve fiber running from cell body to synapse Synapse – terminating end of neuron.

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Presentation transcript:

Types of Neurons and Nerve Impulses

Parts of a Neuron Cell body Axon – nerve fiber running from cell body to synapse Synapse – terminating end of neuron Dendrite – branched receptors on cell body Myelin sheath – fat deposits that insulate axon Nodes of Ranvier- gaps in m.s.

Classifying Neurons Can be classified by function Sensory neurons- Begin afferent pathway Begin afferent pathway Receptors or naked nerve endings (pain) Receptors or naked nerve endings (pain) Motor Neurons Efferent pathway Efferent pathwayInterneurons Connect motor and sensory neurons Connect motor and sensory neurons

Types of Neurons Multipolar – multiple fibers extending from the cell body Ie. Motor neurons Ie. Motor neurons Bipolar – two fibers Ie. Interneurons Ie. Interneurons Unipolar – only one process Ie. Sensory neurons Ie. Sensory neurons

In PNS Action potential travels faster because of Schwann cells Can’t move through myelin, so skips over them, causing impulse to travel faster

Blocking Nerve Impulses Some things can slow down or stop nerve transmission Alcohol, Drugs, Anesthetics, can all slow down nerve transmission.

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