The
wall of the fallopian tube includes an elaborately
folded mucosa surrounded by a muscularis. 
Mucosal folds occupy most of the
potential lumenal space, so that cilia
on the epithelial surface can effectively move the egg toward the uterus.
The simple columnar
epithelium of the mucosa contains both secretory cells and ciliated
cells.
The
thickness of both layers varies along the length of the tube, with the muscle
layer becoming much thicker (and eventually merging with the myometrium)
as the tube passes toward the uterus.
