Small
Intestine
Jejunum (8 feet) and ileum (12 feet) continue degenerative process. Surface area increased by plica circulares (circular folds) carrying villi: cells of villi carry microvilli. Each villus has a capillary and a lacteal (lymphatic capillary) Absorption of digested foodstuffs is via these to the rich venous and capillary drainage of the gut. Towards the end of the small intestine accumulations of lymphoid tissue (Peyer's patches) more common. Undigested residue of food is rich in bacteria.