Resumen

GUTIERREZ-NORIEGA, Carlos. Sobre la ritmicidad de los movimientos de locomoción. Rev. perú. med. exp. salud publica, jun. 1944, vol.3, no.2, p.79-95. ISSN 1726-4634.

Rhythmic movements of flexion and extension of the extremities (stepping movements) were studied in decerebrated cats by means of longitudinal median section and unilateral ablation or hemiablation of the brain stem and hypothalamus. The following results were observed : 1. Longitudinal median section does not alter the coordination of movements. 2. Unilateral ablation of the brain stem and hypothalamus weakens the energy of the movements of the extremities on the side of the ablation. The alteration occurs principally in the movements of flexion of the distal segments of the extremities of the same side, but the rhythmicity of the proximal segments remains. 3. Destruction of the superior and inferior colliculus does not alter the rhythmicity, but destruction of the region situated between right and left colliculus definitely does destroy rhythmicity. 4. In accordans with the results obtained with these experiments, an explanation of the neurophysiological mechanism of rhythmic movements is offered.