answers: the lumen
context: is therefore mobile (unlike the parts of the colon immediately before and after it). The proximal two-thirds of the transverse colon is perfused by the middle colic artery, a branch of the superior mesenteric artery (SMA), while the latter third is supplied by branches of the inferior mesenteric artery (IMA). The "watershed" area between these two blood supplies, which represents the embryologic division between the midgut and hindgut, is an area sensitive to ischemia. The descending colon is the part of the colon from the splenic flexure to the beginning of the sigmoid colon. One function of the descending colon </s> Haustrum (anatomy) The haustra (singular haustrum) of the colon are the small pouches caused by sacculation (sac formation), which give the colon its segmented appearance. The teniae coli run the length of the large intestine. Because the taenia coli are shorter than the intestine, the colon becomes sacculated between the teniae coli, forming the haustra. Haustral contractions are slow segmenting, uncoordinated movements that occur approximately every 25 minutes. One haustrum distends as it fills with chyme, which stimulates muscles to contract, pushing the contents to the next haustrum. Also see peristalsis. There is a wider distance between haustra than between </s> will be more efficient absorption of fatty acids and glycerol into the blood stream. They have a rich blood supply to keep a concentration gradient. Intestinal villus Intestinal villi (singular: villus) are small, finger-like projections that extend into the lumen of the small intestine. Each villus is approximately 0.5–1.6 mm in length (in humans), and has many microvilli projecting from the enterocytes of its epithelium which collectively form the striated or brush border. Each of these microvilli are much smaller than a single villus. The intestinal villi are much smaller than any of the circular folds in the intestine. Villi
question: where is the villi located in the small intestine