Histology of the uterine tube in various cross-sections showing its narrowing as it approaches the uterus. Left , in the region of the ampulla (close to ovary); middle, at the isthmus; right, within the wall of the uterus. The internal mucosa of epithelium is increasingly surrounded by smooth muscle for peristaltic contractions of the uterine tube. haematoxylin-eosin stain. Sobotta, J. (1938) Atlas und Lehrbuch der Histologie und mikroskopischen Anatomie. J.F.Lehmann, Munchen, plate 73. Magnification all x7 printed at 10 cm.