Effects from the sensorimotor cortex on the spinal cord in cats with transected pyramids.

摘要: Effects of stimulation the sensorimotor cortex on activity lumbosacral cord were studied in pyramidotomized cats. The following actions initiated by corticofugal volleys found: 1. postsynaptic effects motoneurones, mainly excitatory flexor motoneurones and inhibitory or extensor 2. facilitation spinal reflexes to at an interneuronal level, 3. depolarization presynaptic terminals group Ib cutaneous fibres. latencies earliest cortical as indicated modification monosynaptic PSPs 9–12 msec. Experiments with lesions different tracts suggest that are mediated pathways ventral part lateral funiculus (probably reticulospinal), reflex transmission dorsal rubrospinal) primary afferent both former latter pathways. strongest evoked area around postcruciate dimple.