Persistence of the nasotrigeminal reflex after pontomedullary transection
| Autor: | Qi Gan, W. Michael Panneton, D. Wei Sun |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Male
Pulmonary and Respiratory Medicine Bradycardia Apnea Physiology Blood Pressure Article Rats Sprague-Dawley Ammonia Heart Rate Pons Reflex Heart rate medicine Animals Anesthesia Trigeminal Nerve Medulla Medulla Oblongata business.industry General Neuroscience Spinal cord Stimulation Chemical Rats Nasal Mucosa medicine.anatomical_structure Vasoconstriction Respiratory Mechanics Medulla oblongata Brainstem Nasal Cavity Nerve Net medicine.symptom business Brain Stem |
| Zdroj: | Respiratory Physiology & Neurobiology. 180:230-236 |
| ISSN: | 1569-9048 |
| Popis: | Most behaviors have numerous components based on reflexes, but the neural circuits driving most reflexes rarely are documented. The nasotrigeminal reflex induced by stimulating the nasal mucosa causes an apnea, a bradycardia, and variable changes in mean arterial blood pressure (MABP). In this study we tested the nasotrigeminal reflex after transecting the brainstem at the pontomedullary junction. The nasal mucosae of anesthetized rats were stimulated with ammonia vapors and their brainstems then were transected. Complete transections alone induced an increase in resting heart rate (HR; p < 0.001) and MABP (p < 0.001), but no significant change in ventilation. However, the responses to nasal stimulation after transection were similar to those seen prior to transection. HR still dropped significantly (p < 0.001), duration of apnea remained the same, as did changes in MABP. Results from rats whose transection were incomplete are discussed. These data implicate that the neuronal circuitry driving the nasotrigeminal reflex, and indirectly the diving response, is intrinsic to the medulla and spinal cord. |
| Databáze: | OpenAIRE |
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