Small quantities of very small fatty acids are able to directly enter the intestinal capillaries of the villi of the small intestine and hence enter the blood stream in this way. However, the majority of fatty acids are long chained and are absorbed quite differently. Within the intestinal lumen, bile salts form aggregates called micelles that are water soluble. Fatty acids and monoglycerides are aggregated into the centres of the micelles. The micelles transport the fatty acids and monoglycerides to the brush borders of the villi. From here, the fatty acids and monoglycerides diffuse into the epithelial cells of the villi. The micelles continue their ferrying function in the intestinal lumen. Within the epithelial cells, the fatty acids and monoglycerides are resynthesised into triglycerides. The triglycerides combine with cholesterol, lipoprotein, and phospholipids to form globules called chylomicrons. The chylomicrons leave the epithelial cells and enter into the lacteal of the villus. Lymphatic vessels then carry the chylomicrons to the venous blood of the left subclavian vein via the thoracic duct.