The<unk>  slow the passage of the partly digested food along the intestines, and afford an increased surface for absorption. They are covered with small finger-like projections called villi (singular, villus). Each villus, in turn, is covered with microvilli. The microvilli absorb fats and nutrients from the chyme.
Circular folds
Synechia 
Venous translucence
Siegrist streaks
Owl's eye appearance
Mayer waves
Stretch marks
Knuckle pads