ruga

1. Results: 1. A ruga jutted out from the mucosa and submucous layer toward the lumen, forming a ∩ shape in the lumen.
   结果：1.粘膜和粘膜下层向肠腔内凸起形成一个皱襞，使肠腔里∩形；

noun

1. (anatomy) a fold or wrinkle or crease
   1. rugae of the stomach