Respiratory neurones of the ventrolateral nucleus of the solitary tract of cat: Vagal input, spinal connections and morphological identification

摘要: Abstract (1) Electrical activity of single cells was recorded extracellularly in the vicinity solitary tract complex medulla oblongata pentobarbital anaesthetized, paralysed cats. The anatomical location and gross morphological properties some neurones were determined by a fluorescent dye (Procion Yellow) injection technique. (2) Of total 279 studied, 261 fired rhythmically with phase respiratory cycle, i.e., neurones. Most (238 cells) discharged phrenic, they wereinspiratory (3) 73 anatomically identified found ventrolateral nucleus which proved somewhat heterogenous roughly equal mixture ‘inspiratory-vagal’, ‘inspiratory-non-vagal-spinal’ along few ‘inspiratory-expiratory’, expiratory non-respiratory (4) Inspiratory could be divided into 2 main groups on basis their vagal spinal connections: inspiratory driven electrical stimuli to cervical vagus influenced lung inflations; not afferents but short latency from columns contralateral side cord. (5) ‘inspiratory-vagal’ showed even when expansion prohibited, thus resembling Rβ von Baumgarten Kanzow.