pyloric constriction

py·lor·ic con·stric·tion

circular groove on the external aspect of the gut at the gastroduodenal junction overlying the pyloric sphincter, thus demarcating the pyloric orifice.

pyloric constriction

the constriction at the distal end of the pylorus, overlying the pyloric orifice, marking the junction of the stomach and duodenum.

py·lor·ic con·stric·tion

(pī-lōr'ik kŏn-strik'shŭn)
A prominent fold of mucous membrane at the gastroduodenal junction overlying the pyloric sphincter.