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Neuron
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===Structural classification=== ====Polarity==== [[File:Neurons uni bi multi pseudouni.svg|thumb|Different kinds of neurons:<br />1 [[Unipolar neuron]]<br />2 [[Bipolar neuron]]<br />3 [[Multipolar neuron]]<br />4 [[Pseudounipolar neuron]] ]] Most neurons can be anatomically characterized as:<ref name="Betts">{{CC-notice|cc=by4|url=https://openstax.org/books/anatomy-and-physiology/pages/12-2-nervous-tissue}} {{cite book|last1=Betts|first1=J Gordon|last2=Desaix|first2=Peter|last3=Johnson|first3=Eddie|last4=Johnson|first4=Jody E|last5=Korol|first5=Oksana|last6=Kruse|first6=Dean|last7=Poe|first7=Brandon|last8=Wise|first8=James|last9=Womble|first9=Mark D|last10=Young|first10=Kelly A|title=Anatomy & Physiology|location=Houston|publisher=OpenStax CNX|isbn=978-1-947172-04-3|date=June 8, 2023|at=12.2 Nervous tissue}}</ref> * [[Unipolar neuron|Unipolar]]: single process. Unipolar cells are exclusively sensory neurons. Their dendrites receive sensory information, sometimes directly from the stimulus itself. The cell bodies of unipolar neurons are always found in ganglia. Sensory reception is a peripheral function, so the cell body is in the periphery, though closer to the CNS in a ganglion. The axon projects from the dendrite endings, past the cell body in a ganglion, and into the central nervous system. * [[Bipolar cell|Bipolar]]: 1 axon and 1 dendrite. They are found mainly in the [[olfactory epithelium]], and as part of the retina. * [[Multipolar neuron|Multipolar]]: 1 axon and 2 or more dendrites ** [[Golgi I]]: neurons with long-projecting axonal processes; examples are pyramidal cells, Purkinje cells, and anterior horn cells ** [[Golgi II]]: neurons whose axonal process projects locally; the best example is the granule cell * [[Anaxonic neuron|Anaxonic]]: where the axon cannot be distinguished from the dendrite(s) * [[Pseudounipolar cells|Pseudounipolar]]: 1 process which then serves as both an axon and a dendrite ====Other==== Some unique neuronal types can be identified according to their location in the nervous system and distinct shape. Some examples are:{{citation needed|date=July 2022}} * [[Basket cell]]s, interneurons that form a dense plexus of terminals around the soma of target cells, found in the cortex and [[cerebellum]] * [[Betz cell]]s, large motor neurons in [[primary motor cortex]] * [[Lugaro cell]]s, interneurons of the cerebellum * [[Medium spiny neuron]]s, most neurons in the [[corpus striatum]] * [[Purkinje cell]]s, huge neurons in the cerebellum, a type of Golgi I multipolar neuron * [[Pyramidal cell]]s, neurons with triangular soma, a type of Golgi I * [[Rosehip neuron|Rosehip cells]], unique human inhibitory neurons that interconnect with Pyramidal cells * [[Renshaw cell]]s, neurons with both ends linked to [[alpha motor neuron]]s * [[Unipolar brush cell]]s, interneurons with unique dendrite ending in a brush-like tuft * [[Granule cell]]s, a type of Golgi II neuron * [[Anterior horn (spinal cord)|Anterior horn]] cells, [[motoneurons]] located in the spinal cord * [[Spindle neuron|Spindle cells]], interneurons that connect widely separated areas of the brain
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