A ring 10Jul 202123 Oct 2021 inferior esophageal sphincter2-4 cm proximal to B ringthicker ring produced by active muscle contraction Click to share on WhatsApp (Opens in new window)Click to share on Telegram (Opens in new window)Click to email a link to a friend (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Like this:Like Loading...