For those fortunate enough to walk normally, wandering is such an expected behavior that we hardly consider that it involves complex, partly involuntary processes. "Animals move to explore their environment in search of food, interaction with others, or simply out of curiosity. But the perception of danger or a painful stimulus can also activate an automatic flight reflex", Martin Carbo-Tano, a post-doctoral fellow at Paris Brain Institute, explains. In both cases, movement initiation relies on the activation of so-called reticulospinal control neurons, which form an intertwined network in the most posterior part of the brain—the brainstem.

https://www.miragenews.com/vertebrate-locomotion-new-neuron-mapping-1077402/

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