[Electrophysiological investigation on decussate communication of bulbospinal inspiratory neurons with phrenic nucleus at level of spinal cord].
The experiments were carried out on anesthetized, vagotomized, immobilized and artificially ventilated cats, rabbits and rats. The rhythmic respiratory activities on both sides of the phrenic nerves existed after a hemisection between the 2nd and 3rd cervical cord, while the activities of the phrenic nerve ipsilateral to the hemisection disappeared following a subsequent mid-sagittal section from the 3rd to 5th cervical cord. The amplitude of the phrenic activities on either side was lowered, more remarkably on the ipsilateral side, by the hemisection. These results indicate that there exists a decussate communication of the bulbospinal inspiratory neurons with the phrenic nucleus at the level of spinal cord. In other words, the phrenic nucleus receives inspiratory drives via descending pathways on both sides of the cervical cord, mainly on the ipsilateral side.
Zheng
Y
Y
Li
F
F
Wei
M
M
Li
L
L
D000818:Animals; D002415:Cats; D004525:Efferent Pathways / Q000502:physiology; D004594:Electrophysiology; D008526:Medulla Oblongata / Q000502:physiology*; D009474:Neurons / Q000502:physiology; D010791:Phrenic Nerve / Q000502:physiology*; D011817:Rabbits; D051381:Rats; D017207:Rats, Sprague-Dawley; D012119:Respiration / Q000502:physiology*; D013116:Spinal Cord / Q000601:surgery