The ducts of Brunner's glands.
D000368:Aged; D000715:Anatomy / Q000266:history; D000818:Animals; D002011:Brunner Glands / Q000033:anatomy & histology*; D002415:Cats; D004386:Duodenum / Q000033:anatomy & histology*; D049670:History, 17th Century; D006801:Humans; D008297:Male; D051381:Rats