Abstract
Formation of the bovine spiral colon was studied in fetuses between 2.1 cm and 25.0 cm crown-rump length. The first evidence of looping of the proximal colon was seen at 3.5 cm. By 6.5 cm the looping colon was beginning to assume the form of a coil, and by 9.3 cm the coiling colon was beginning to appear conical. The conical proximal colon athieved the elliptical disc-like adult form with centripetal and centrifugal coils between the 13 cm to 23 cm stage.
