Small intestine
It is approximately 1.5 cm in diameter in newborns after 35 weeks of gestational age, and 2.5–3 cm (1 inch) in diameter in adults. On abdominal X-rays, the small intestine is considered to be abnormally dilated when the diameter exceeds 3 cm. On CT scans, a diameter of over 2.5 cm is considered abnormally dilated. The surface area of the human small intestinal mucosa, due to enlargement caused by folds, villi and microvilli, averages 30 square meters.
Chitterlings
Both large and small intestine (typically pig) is eaten throughout China. Large intestine is called "feichang", literally "fat intestine" because it is fatty. Small intestine is called "zhufenchang", literally "pig powder intestine" because it contains a white, pasty or powdery substance. The character "zhu" or "pig" is added at the beginning to disambiguate. This is because, in Cantonese cuisine, there is a dish called "chang fen" which uses intestine-shaped noodles.