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Anatomy Tutorial: Neuron Classification

4 weeks ago
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MgujSMP.png

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\({\bf{Classifications~of~Neurons:}}\) two types, structural and functional Structural: > anaxonic: axons and dendrites are indistinguishable. only in CNS and some sense organs. > bipolar: cell body between axon and dendrite. dendrites fuse to form single dendrite. sensory information for sight/smell/hearing > pseudounipolar: initial segment where dendrites converge. cell body off to the side but still between axon + dendrite. > multipolar: several dendrites, 1 axon, multiple branches, most common in CNS esp. motor neurons. |dw:1539581548702:dw|

4 weeks ago
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Functional Classification: > sensory: carry information to CNS - axons are afferent fibers; connect brain/spinal cord to sensory receptors - somatic sensory neurons: carry information about the outside environment - visceral sensory neurons: carry information about internal environment > receptors: - interoceptors: digestive, respiratory, cardiovascular, urinary, reproductive system, presure, pain, taste - exteroreceptors: touch, temperature, and pressure, sight, smell, hearing - proprioreceptors: position of body parts relative to body > motor neurons: - axons are efferent fibers - SNS: somatic motor neurons, innervate skeletal muscles; connect CNS to NMJs - ANS: viseral motor neurons > two groups within the ANS, one w/ cell bodies in the CNS and other in the peripheral ganglia > preganglionic fibers (between CNS to ganglion) and postganglionic fibers (ganglion to effectors) > interneurons: input sensory information, output motor effects - excitatory vs inhibitory (release excitatory neurotransmitters vs inhibitory neurotransmitters)

4 weeks ago
Moon:

Adapted from Human Anatomy, Martini, et. al. 9th edition

3 weeks ago
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