Neuron - highly specialized cell that transmits electrical impulses - PowerPoint PPT Presentation

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Neuron - highly specialized cell that transmits electrical impulses

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  1. Neuron-highly specialized cell that transmits electrical impulses Stephen M. Fowler

  2. Nervous System • Central Nervous System (CNS)- brain and spinal chord • Peripheral Nervous System (PNS)- all nerves extending from and going to the CNS • Composed of over 100 billion neurons

  3. Elements of a Neuron

  4. Neurotransmitters • Are required along with vesicles to transmit a nerve impulse from one neuron to another over the synapse.

  5. Classes of Neurons • Afferent- do not have dendrites: transmit impulses from specialized structures to the Central Nervous System • Efferent- conduct electrical signals from the CNS to muscle or glad cells • Inter- reside entirely within the CNS and make up about 99% of all neurons

  6. Neuroscience Terminology • Nerve- bundle of axons in the PNS • Pathway- bundle of axons in the CNS • Commissure- a collection of nerve fibers linking the left and right halves of the CNS • Nuclei- cell bodies linked together in the CNS • Ganglia- cell bodies linked together in the PNS

  7. References • Pasternak • http://en.wikipedia.org/wiki/Main_Page • http://psych.athabascau.ca/html/Psych402/Biotutorials/2/myelin.shtml