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NEURON
 

NEURON

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    NEURON NEURON Presentation Transcript

    • Structure of Neuron Made by Sakshi Gupta Xth B
    • Cells of Nervous System Neurons or nerve • cells –Receive stimuli and transmit action potentials –Organization ● •Cell body or soma ● •Dendrites: Input ● •Axons: Output
    • Structure and Function Typical Neuron has 4 Regions Cell Body • • Dendrites • Axon • PresynapticTerminals
    • 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
    • Neuron Classification
    • Neuron AnatomyExtensions outsidethe cell bodyDendrites –conductimpulses towardthe cell bodyAxons –conductimpulses awayfrom the cell body (only 1!)
    • 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)
    • 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
    • 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