The<unk>  (also known as valves of Kerckring, valves of Kerchkring, plicae<unk> es, plicae<unk> , and valvulae conniventes) are large valvular flaps projecting into the lumen of the small intestine.
Circular folds
Synechia 
Venous translucence
Siegrist streaks
Owl's eye appearance
Mayer waves
Stretch marks
Knuckle pads