This is a quote from website barretsinfo,com that you showed "In addition to the LES, the gastroesophageal flap valve may close when the stomach is full"
I have seen that website a lot. That is not the only one that list the 2 separately. I did some surfing earlier in the morning and found several sites list them as 2 separate things. Everything I have read indicates the LES should close all the way after it relaxes during the swallowing sequence and allows food and liquids to pass into the stomach. The LES is helped to stay closed by the diaphragm.
Within the last year or so they have hashed out what parts are what between the stomach and esophagus from what I have been reading. There was a huge debate over what parts belonged to what organ.
Nissen 6/06 and 5/09
#3 on 8/24/11
Post Edited (opnwhl4) : 10/4/2011 1:32:09 PM (GMT-6)