Wednesday 8 October 2014

Contd......

Motor Neurons receives signals from the BRAIN and Spinal Cord,, to cause muscle contractions,, and affect glandular outputs,, and inter-neurons which connect neurons to other neurons within the same region of the brain or spinal cord,, in neural networks..

A typical neuron possesses a cell body,, dendrites,, and an axon.. The term neurite is used to describe either a dendrite or an axon,, particularly in its undifferentiated stage.. Dendrites are thin structures that arise from the cell body,, often extending for hundreds of micrometres and branching multiple times,, giving rise to a complex "dendritic tree".. An axon is a special cellular extension that arises from the cell body at a site called the axon hillock and travels for a distance,, as far as 1 meter in humans or even more in other species.. The cell body of a neuron frequently gives rise to multiple dendrites,, but never to more than one axon,, although the axon may branch hundreds of times before it terminates.. At the majority of synapses,, signals are sent from the axon of one neuron to a dendrite of another.. There are,, however,, many exceptions to these rules: neurons that lack dendrites,, neurons that have no axon,, synapses that connect an axon to another axon or a dendrite to another dendrite,, etc..

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