The lining epithelium is simple columnar/pseudostratified
columnar with motile cilia. Both ciliated and nonciliated cell types
possess microvilli.

Lamina muscularis is absent. Lamina propria-submucosa
consist of loose connective tissue with many plasma cells, mast cells,
eosinophils.
In ampulla, the tunica mucosa is highly infolded forming primary,
secondary and tertiary folds, while in isthmus region only primary
folds are present.
Tunica muscularis comprises of inner circular smooth muscles with
isolated bundles of longitudinal and oblique muscle fibers.
Tunica serosa is reflection of peritoneum having fibrous tissues
covered by mesothelium. Numerous blood vessels and nerves are also
present.