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Un mapa funcional para diversas acciones de los miembros anteriores dentro de los circuitos del tronco cerebral

Ludwig Ruder1,2, Riccardo Schina1,2, Harsh Kanodia1,2

  • 1Biozentrum, Department of Cell Biology, University of Basel, Basel, Switzerland.

Nature
|January 7, 2021
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores mapearon los circuitos del tronco cerebral para los movimientos hábiles de las extremidades anteriores. Las poblaciones neuronales específicas en la médula rostral lateral (latRM) controlan acciones como alcanzar y manipular alimentos, revelando nuevos conocimientos sobre el control motor.

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Área de la Ciencia:

  • La neurociencia
  • Control del motor
  • Circuitos del tronco cerebral

Sus antecedentes:

  • El tronco cerebral es crucial para el control de los movimientos del cuerpo.
  • La comprensión del control neuronal de los movimientos hábiles de las extremidades anteriores es limitada, centrándose en los centros cerebrales superiores y la médula espinal.

Objetivo del estudio:

  • Definir el mapa funcional de los movimientos hábiles de las extremidades delanteras dentro de la médula rostral lateral del tronco cerebral (latRM).
  • Identificar poblaciones y circuitos neuronales específicos responsables de las acciones complejas de las extremidades anteriores.

Principales métodos:

  • In vivo electrofisiología en ratones que se mueven libremente.
  • Manipulación genética y técnicas de rastreo viral.
  • Estimulación optogenética de las poblaciones neuronales.

Principales resultados:

  • Identificó un código neuronal en poblaciones latRM sintonizadas con distintas acciones de las extremidades anteriores (por ejemplo, alcanzar, manipular alimentos).
  • La perturbación de las neuronas latRM excitadoras alteró estas acciones.
  • Las neuronas latRM excitatorias se segregan por el objetivo axonal, reclutando diferencialmente el tronco cerebral y los circuitos espinales.
  • La estimulación optogenética de las poblaciones latRM definidas por proyección provocó movimientos diversos y estables de las extremidades anteriores.

Conclusiones:

  • Las poblaciones de tronco cerebral estratificadas por proyección en el latRM codifican las fases de acción.
  • Estas poblaciones actúan como bloques de construcción para regular los movimientos complejos de las extremidades anteriores.
  • Identificó sustratos clave del tronco cerebral para comportamientos hábiles de las extremidades anteriores.