neuron sakshi

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Khushbu on Jul 24, 2012 Says :

very well presented ppt on neurons.

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Slide 1 :

Structure of Neuron Made by Sakshi Gupta Xth B

Slide 2 :

Cells of Nervous System •Neurons or nerve cells –Receive stimuli and transmit action potentials –Organization •Cell body or soma •Dendrites: Input •Axons: Output

Slide 3 :

Typical Neuron has 4 Regions •Cell Body •Dendrites •Axon •Presynaptic Terminals Structure and Function

Slide 4 :

·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 nervous system Functional Classification of Neurons

Slide 5 :

Neuron Classification

Slide 6 :

Neuron Anatomy Extensions outside the cell body Dendrites – conduct impulses toward the cell body Axons – conduct impulses away from the cell body (only 1!)

Slide 7 :

Dendrites of Motor Neurons •Short, tapering, and diffusely branched processes •They are the receptive, or input, regions of the neuron •Electrical signals are conveyed as graded potentials (not action potentials)

Slide 8 :

•Slender processes of uniform diameter arising from the hillock •Long axons are called nerve fibers •Usually there is only one unbranched axon per neuron •Rare branches, if present, are called axon collaterals •Axonal terminal – branched terminus of an axon Axons: Structure

Slide 9 :

•Whitish, fatty (protein-lipid), segmented sheath around most long axons •It functions in: –Protection of the axon –Electrically insulating fibers from one another –Increasing the speed of nerve impulse transmission Myelin Sheath

Slide 10 :

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