Electrophysiological aspects of reflexogenic area in the chelonian, Geoclemmys reevesii.
Electrophysiological and anatomical experiments were performed to determine the baro- and chemoreceptive area of the turtle, Geoclemmys reevesii. The baro- and chemoreceptive sites are located in the aortic and pulmonary arches and the truncal region. The aortic arch is innervated by both the superior truncal nerve (aortic nerve) and a branch of the inferior truncal nerve arising from the ganglion trunci of the vagus. The pulmonary arch is innervated by a fine branch of the inferior truncal nerve, a branch containing mainly barosensitive and a few chemosensory fibers. On the peripheral cut end of these nerves, afferent electrical baro- and chemosensory activities were induced by NaCN and hyperoxia. Fluorescence microscopy revealed that the glomus cells are located in these regions.
D000344:Afferent Pathways / Q000502:physiology; D000818:Animals; D001011:Aorta / Q000294:innervation; D001013:Aorta, Thoracic / Q000294:innervation; D002628:Chemoreceptor Cells / Q000502:physiology; D004594:Electrophysiology; D005260:Female; D008168:Lung / Q000294:innervation; D008297:Male; D009420:Nervous System / Q000033:anatomy & histology; D011311:Pressoreceptors / Q000502:physiology; D012018:Reflex / Q000502:physiology*; D014338:Truncus Arteriosus / Q000294:innervation; D014426:Turtles / Q000502:physiology*