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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.
Medical Definition of descent. 1  1: the act or process of descending from a higher to a lower location descent of the testes into the scrotum. 2  2a: derivation from an ancestorb: the fact or process of originating by generation from an ancestral stock (as a species or genus)