neuron and impulse
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- 4 main composing factors of neurons
-
-dendrites
-cell body
-axon
-terminal boutons - dendrites
- receive message, signal has to be strong enough. collect electrical message, radiate from the cell body.
- cell body
- contains a nucleus and organelles, axon too.
- axon
- delivers electrical signals to dendrites of another cell to an effector cell, long and wirelike. ends with a terminal bouton
- terminal boutons
- knoblike structures at the end of an axon
- 3 types of neurons
-
1. sensory (afferent)
2. motor (efferent)
3. interneurons - sensory neurons
- carry information to the brain
- motor neurons
- carry information from the brain
- interneurons
- connecting neurons, responsible for integration and "mind"
- 4 functions of astrocytes (as part of CNS)
-
1. provide spinal scaffolding for neurons
2. help support neurons metabolically
3. help in repair of brain injury
4. help degrade neurotransmitters