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This type of descending motor pathway originates in the brainstem and governs automatic movements that help regulate muscle tone, posture and balance.
Group of Neurons Forming Tracts. In terms of basic anatomy, the overall ascending pathway is made up of three different types of neurons. Firstly, there are first order neurons which receive sensory information from the receptors and send them to sensory neurons present in the posterior gray horns of spinal cord. The cell body of these neurons are found within the posterior nerve root ganglion. Next, there are second order neurons.