[Reticular structures and reticulospinal pathways participating in initiation and inhibition of spino-bulbo-spinal activity].
Efferent discharges in intercostal nerves and activity of reticulospinal fibres during stimulation of the brain stem reticular formation, intercostal splanchnic nerves were recorded in cats anesthetized with chloralose (50 mg/kg). It is found that the structures involved in the transmission of spino-bulbo-spinal activity are located in the medial bulbar and pontine reticular formation as well as in its lateral regions. The structures producing long-lasting (300-800 ms) inhibition of spino-bulbo-spinal reflexes are also wide distributed in the brain stem, especially in the pontine region. Recording of activity of single reticulospinal fibres in the ventral (conduction velocity 16-120 m/s) and lateral (17-100 m/s) funiculi during spino-bulbo-spinal reflexes showed that both medial and lateral reticulospinal tracts may be involved into this reflex mechanism. New evidence is obtained that the inhibition of spino-bulbo-spinal reflexes may be located at supraspinal level.
D000818:Animals; D001931:Brain Mapping; D002415:Cats; D004558:Electric Stimulation; D004594:Electrophysiology; D007367:Intercostal Nerves / Q000502:physiology; D009431:Neural Conduction; D009434:Neural Pathways; D011149:Pons / Q000502:physiology; D012018:Reflex; D012154:Reticular Formation / Q000502:physiology*; D013116:Spinal Cord / Q000502:physiology*; D013153:Splanchnic Nerves / Q000502:physiology
Retikuliarnye struktury i retikulo-spinal'nye puti, uchastvuiushchie v initsiatsii i tormozhenii spino-bul'bo-spinal'noĭ aktivnosti