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Anatomy: N. Tissue
Lecture 13: Nervous Tissue
Question | Answer |
---|---|
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 |
Axon | Carries an impulse (action potential) AWAY from cell body |
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 |
Unipolar | relating to Sensory neuron divides into branches 1. Peripheral Process 2. Central Process |
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. |
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 |