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Published byFrank Howard Modified over 8 years ago
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Neurons
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Functional Classification of Neurons Sensory(Afferent) Neurons Motor (Efferent) Neurons Association Neurons (Interneurons)
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Sensory (Afferent) Neurons Neurons carrying impulses from sensory receptors to the CNS. Found in ganglion outside the CNS. Dendrite endings associated with specialized receptors.
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Specialized Receptors Free nerve endings (pain & temperature) Meissner’s corpuscle (touch receptor) Lamellar corpuscle (deep pressure receptor) Golgi tendon organ (proprioceptor) Muscle spindle (proprioceptor) Proprioceptor – detect the amount of stretch, or tension, in skeletal muscles, their tendons, and joints
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Motor (Efferent) Neurons Neurons carrying impulses from the CNS to the viscera and/or muscles and glands. Cell bodies are always located in the CNS.
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Association Neurons or Interneurons Connect the motor and sensory neurons in a neural pathway. Cell bodies are always located in the CNS. http://img.tfd.com/dorland/thumbs/interneuron.jpg
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Structural Classifications of Neurons Multipolar Neuron Bipolar Neuron Unipolar Neuron
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Multipolar Neurons Most common structural type. Motor neurons and association neurons.
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Bipolar Neurons Rare Found in ears and eyes Sensory receptor cells.
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Unipolar Neurons Single short process emerging from cell body. Divides into proximal and distal processes. Dendrites at the end of proximal process. Neurons in PNS ganglia.
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