The Fallopian tube is also called uterine tube or oviduct. It is divided into four parts or segments- infundibulum (or preampulla), ampulla, isthmus and junctura (or utero-tubal junction). It has numerous mucosal folds which help to increase its secretory surface. It secretes various substances which aid gametic and embryonal manipulation before implantation. The area in the picture is the ampulla. Note its numerous mucosal folds (not villi for they are projections from the underlying lamina propria which is continuous with the mucosal folds (green)). The muscularis externa is stained pinkish.

Differential diagnosis: The fallopian tube can be confused with any luminal organ such as appendix, trachea/bronchi or small intestine. The small intestine has villi and not mucosal folds, trachea has pseudostratified epithelium and no columnar cells, appendix is devoid of villi or mucosal folds.

Ultrastructure
Histology
Embryology
Gross anatomy