Lecture 13: Nervous Tissue
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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| Dendrites | Processes that carry electrical activity TOWARD the cell body
do not carry impulses (action potentials)
conduct a graded potential
Electrical disturbances at root of axon (ideal)
if large, may trigger axon to fire an impulse
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| Axon | Carries an impulse (action potential) AWAY from cell body
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| Neurons classified structurally by # of processes | multipolar: vast majority
2+ processes, mean. many dendrites, one axon
most interneurons and motor neurons
Unipolar: only in sensory neurons
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| Unipolar | relating to Sensory neuron
divides into branches
1. Peripheral Process
2. Central Process
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| Why are sensory neurons sometimes called pseudo-unipolar neurons? | In embryo stage, the sensory neuron branches (processes) are actually 2 separate branches, but are fused into one.
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| Why can unipolar sensory neurons be both axons and dendrites | 1. Peripheral Process: Send information toward cell body like dendrite
BUT also conducts an impulse like an axon.
In end, call it an axon
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