NEURON

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NEURON

  1. 1. Structure of Neuron Made by Sakshi Gupta Xth B
  2. 2. Cells of Nervous System Neurons or nerve • cells –Receive stimuli and transmit action potentials –Organization ● •Cell body or soma ● •Dendrites: Input ● •Axons: Output
  3. 3. Structure and Function Typical Neuron has 4 Regions Cell Body • • Dendrites • Axon • PresynapticTerminals
  4. 4. Functional Classification of Neurons·Sensory (afferent) neurons·Carry impulses from the sensory receptors·Cutaneous sense organs·Proprioceptors – detect stretch or tension·Motor (efferent) neurons·Carry impulses from the central nervoussystem
  5. 5. Neuron Classification
  6. 6. Neuron AnatomyExtensions outsidethe cell bodyDendrites –conductimpulses towardthe cell bodyAxons –conductimpulses awayfrom the cell body (only 1!)
  7. 7. Dendrites of Motor Neurons•Short, tapering, anddiffusely branchedprocesses•They are thereceptive, or input,regions of theneuron•Electrical signals are conveyed as gradedpotentials (not action potentials)
  8. 8. Axons: Structure•Slender processes of uniform diameter arising from the hillock•Long axons are callednerve fibers•Usually there is only oneunbranched axon per neuron•Rare branches, if present, are called axoncollaterals•Axonal terminal – branched terminus of an axon
  9. 9. Myelin Sheath•Whitish, fatty (protein-lipid), segmented sheatharound most longaxons•It functions in:–Protection of the axon–Electrically insulating fibers from one another–Increasing the speed of nerve impulsetransmission

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