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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Transmit nerve impulses from receptors in the skin, sense organs, muscles, joints and viscera toward the brain and spinal cord.
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Sensory (Afferent) Neurons
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Neuron
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Convey nerve impulses from the brain and spinal cord to effectors which may be either muscles or glands
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Motor (efferent) Neurons
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Neuron
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All other neurons that are not specifically sensory or motor neurons. Most neurons in the body, perhaps 90% are this type of neuron
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Interneurons (association neurons)
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Neuron
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Classification of Neurons- neurons are classified according to the number of processes extending from the cell body
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Structural Classification
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structural or functional
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Classification of Neurons- neurons are classified according to the direction in which they transmit nerve impulses
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Functional Classification
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structural or functional
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Name structurally classified neurons
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Multipolar
Bipolar Interneurons |
3 types
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Name functionally classified neurons
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Sensory (afferent) Neurons
Motor (efferent) Neurons Interneurons Neurons |
3 types
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Have one main dendrite and one axon. They are found in the retina of the eye, in the inner ear and in the olfactory area of the brain
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Bipolar Neurons
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structural
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Are sensory neurons that originate in the embryo as bipolar neurons. During development the axon and dendrite fuse into a single process that divides into two branches a short distance from cell body; both branches have a characteristic structure and function of an axon.
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Unipolar Neurons
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the dendrites monitor a sensory stimulus such as touch or stretching
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This is brain matter- it is aggregations of myelinated processes from many neurons
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White matter
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white or grey
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This is brain matter- contains neuronal cell bodies, dendrites unmyelinated axons, axon terminals and neuroglia. Covers the surface of the largest portion of the brain
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Gray matter
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white or grey
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Where do you find Purkinje cells?
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in the cerebellum
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brain
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Where do you find Renshaw cells?
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in the Spinal Cord
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not brain
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Where do you find Pyrimidal cells?
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in the brain
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all of one area
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In unipolar neurons, the trigger zone for nerve impulses is at junction of ______ and ______.
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dendrites and axon
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non
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