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Multipolar Neurons – Structure and Functions

  • Multipolar neurons have three or more processes attached to the image descriptioncell bodies.
Am image showing the basic structure of the multipolar neuron
Am image showing the basic structure of the multipolar neuron, the Cell body is labeled
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  • One process serves as the image descriptionaxon, which conducts electrochemical impulses (action potentials) between cells.
Am image showing the basic structure of the multipolar neuron
Am image showing the basic structure of the multipolar neuron, the axon is labeled
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  • The remaining processes are image descriptiondendrites. Togather, the cell body and dendrites form the receptive zone of multipolar neurons.
Am image showing the basic structure of the multipolar neuron
Am image showing the basic structure of the multipolar neuron, the dendrite is labeled
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  • The dendrites and their branches provide image descriptionadditional surface area for the axons of other neurons to approach and form synapses.
An image showing the synapsing axons on the dendrites of a multipolar neuron
An image showing the synapsing axons on the dendrites of a multipolar neuron, with labeles for synapsing axons and multipolar neuron
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  • A combination of excitatory and inhibitory synapses allows image descriptionneural integration to occur between central nervous system neurons.
  • The axons of multipolar neurons are often very long and can conduct action potentials throughout the brain, down the spinal cord, and along the nerves.

  • Axons are often covered by a series of image descriptionSchwann cells. Impulses only occur at the gaps between schwann cells, which accelerates impulse conduction.
  • Multipolar neurons differ in size and shape depending on their location and function. This variation can be seen in some of the neurons that control body movements.
  • image descriptionPyramidal cells (upper motor neurons) originate in the motor cortex of the brain and carry action potentials to the spinal cord.
An image showing 2 multipolar neuron connected together to allow the action potential movement from the CNS to the effective organ
An image showing the pyramidal cell which is multipolar neuron between the CNS and the motor neuron
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  • From here, image descriptionlower motor neurons (motor neurons) conduct action potentials along the nerves to the skeletal muscle cells, causing them to contract.
An image showing the pyramidal cell which is multipolar neuron between the CNS and the motor neuron
An image showing the Lower motor neuron which is multipolar neuron between the pyramidal neuron and the Effective organ
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  • image descriptionPurkinje cells are part of the cerebellum, which helps coordinate and refine muscular actions as they occur.
An image showing the basic structures of a Purkinje cell, which is multipolar neuron, the dendrites, cellbody and cerebellum
An image showing the basic structures of a Purkinje cell, which is multipolar neuron, the Purkinje cell, dendrites, cellbody and cerebellum
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  • Their large dendritic spread is responsible for their unique appearance. It also allows each Purkinje cell to recieve input from thousands of other neurons.
  • The long Purkinje cell axons provide the sole route out of the cerebellum to other parts of the CNS

Overview:

Test yourself image showing the basic structure of the multipolar neuron, the axon, dendrites and cell body are numbered without answers
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