Motor skills are acquired through repeated training; though learning is slow, established motor memories persist long-term without practice. This process includes an early phase of rapid improvement and a later plateau, engaging distinct circuits and mechanisms. Motor memory formation involves the motor cortex, basal ganglia, and cerebellum. In contrast, brainstem centers have traditionally been regarded as rigid executors of stereotyped motor commands. We argue instead that brainstem plasticity is key for adapting learned skills to new contexts, focusing on the mesencephalic locomotor region (MLR), whose glutamatergic neurons are targeted by the motor cortex, basal ganglia, and cerebellum. Our findings show that motor training induces expression and activation of canonical signaling pathways linked to learning and memory (BDNF/TrkB, ERK/pERK) and that interfering either with de novo protein synthesis or with these pathways impairs motor memory consolidation. Thus, we hypothesize that these molecular changes promote electrophysiological plasticity in MLR circuits, enabling fine-tuning of motor commands in response to environmental demands. We are currently characterizing in vivo electrophysiological properties of MLR neurons across motor training and establishing correlates to validate this model. Together, these findings redefine the MLR as a dynamic contributor to motor learning, with implications for understanding how the brain integrates experience to refine movement.