PHGY 210 Lecture Notes - Lecture 3: Vagus Nerve, Esophagus, Peristalsis
15 Feb 2018
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It turns out, the stomach relaxes just as the bolus is about to enter the oesophagus (cid:9675) That"s a good 8 to 10 seconds before it reaches the stomach. So, it is not short reflexes that cause it. It is the deglutition reflex that causes receptive relaxation. Vagal nerves stimulate inhibitory enteric neurons which then release nanc onto the stomach"s muscles (cid:8226) Do note that there are also other vago-vagal reflexes (cid:9675) (cid:9675) Local distensions in the stomach causes enteric neurons to fire signals up to the deglutition centre through the vagus nerve. Which then sends further signals down the vagus x nerve to inhibitory enteric neurons (cid:8226) (cid:8226) And finally, there are some short reflexes that also cause the stomach to loosen. That said, the short enteric reflexes do not play a significant role in receptive relaxation (cid:9675) (cid:9675)
