The bovine tubouterine junction: general organization and surface morphology.

The bovine tubouterine junction is composed of three parts (terminal tubal segment, transition region proper, uterine apex) and follows a sigmoidal course displaying a tubal and an uterine curvature. In the terminal tubal segment, 4-8 primary longitudinal folds and a system of lower secondary folds, ridges and chords project into the centrally located lumen. The transition region proper possesses a slit-like lumen because of the existence of a thick mucosal pad containing the first uterine glands.