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Vias medulares descendentes

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vías medulares descendentes

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Vias medulares descendentes

  1. 1. NEUROANATOMIA FUNCIONAL VIAS MEDULARES vol. II Pablo Andrés López Bernal, MD.
  2. 2. VIAS DESCENDENTES EFERENTES
  3. 3. ASCENDENTE DESCENDENTE SOMATICA Cortico-espinal Cortico-troncal Cortico-mesencefalica Cortico-pontica Cortico-bulbar VISCERAL
  4. 4. FUNCIONES CORTICOESPINAL • Movimientos voluntarios RETICULOESPINAL • Facilita o inhibe actividad motora voluntaria TECTOESPINAL • Movimiento postural reflejo a estimulo visual y luz RUBROESPINAL • Facilita flexores e inhibe extensores VESTIBULOESPINAL OLIVOESPINAL FIBRAS AUTONOMAS • Facilita extensores e inhibe flexores. Equilibrio • Existe ??? • Control actividad visceral
  5. 5. VIA PIRAMIDAL MOTOR VOLUNTARIO (Veloz y agil)
  6. 6. VIA PIRAMIDAL Haz corticoespinal anterior Haz corticoespinal lateral 1 MOTONEURONA Inicia en la corteza precentral y premotora Atraviesa el brazo posterior de la capsula interna Pedunculo cerebral Pirámide Haz corticoespinal lateral contralateral o anterior ipsilateral Ambas vías terminan en el asta gris anterior contralateral
  7. 7. VIA PIRAMIDAL Haz corticoespinal anterior Haz corticoespinal lateral 2 MOTONEURONA Solo las fibras mas pequeñas hacen sinapsis con la neurona internuncial
  8. 8. VIA PIRAMIDAL Haz corticoespinal anterior Haz corticoespinal lateral 3 MOTONEURONA Inicia en el asta gris anterior Sale por el nervio espinal anterior Termina en la placa motora
  9. 9. VIA RETICULOESPINAL FACILITA O INHIBE MOVIMIENTOS VOLUNTARIOS
  10. 10. VIA RETICULOESPINAL HAZ RETICULOESPINAL PROTUBERENCIAL Haces directos o cruzados que bajan por el cordón blanco anterior HAZ RETICULOESPINAL BULBAR Haces directos o cruzados que bajan por el cordón blanco lateral
  11. 11. VIA RETICULOESPINAL HAZ RETICULOESPINAL PROTUBERENCIAL Haces directos o cruzados que bajan por el cordón blanco anterior HAZ RETICULOESPINAL BULBAR Haces directos o cruzados que bajan por el cordón blanco lateral
  12. 12. VIA TECTOESPINAL MOVIMIENTOS POSTURALES REFLEJOS A ESTIMULOS VISUALES
  13. 13. VIA TECTOESPINAL Inicia en el tubérculo cuadrigemino superior Cruza y desciende en el tallo por el fascículo longitudinal medial Baja por el haz tectoespinal en el cordón blanco anterior SOLO en segmentos cervicales Haz tectoespinal
  14. 14. VIA RUBROESPINAL COMUNICA LA VIA MOTORA CON CEREBRO Y CEREBELO FACILITA FLEXORES E INHIBE EXTENSORES
  15. 15. VIA RUBROESPINAL Haz rubroespinal Recibe información de la corteza cerebral y cebelosa Inicia en el núcleo rojo (tectum del mesencéfalo) Cruza inmediatamente Desciende por el haz rubroespinal Termina en el asta gris anterior
  16. 16. VIA VESTIBULOESPINAL FACILITA EXTENSORES E INHIBE FLEXORES MANTENIMIENTO DEL EQUILIBRIO
  17. 17. VIA VESTIBULOESPINAL Haz vestibuloespinal Recibe información de la corteza cebelosa y el oído interno Inicia en el núcleo vestibular lateral (piso del IV ventriculo) Desciende directamente por el haz vestibuloespinal Termina en el asta gris anterior
  18. 18. FIN … por el momento

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