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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.
The reticulospinal tract (or anterior reticulospinal tract) is an extrapyramidal motor tract that descends from the reticular formation in two tracts to act on the motor neurons supplying the trunk and proximal limb muscles. The fibers of this tract arise from the medullary reticular formation, mostly from the gigantocellular nucleus, and descend the length of the spinal cord in the anterior part of the lateral column. 2  The tract terminates in lamina VII mostly with some fibers terminating in lamina IX of the spinal cord.