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Abstract The ductus deferens from laboratory animals is quite often used for teaching microscopic anatomy and of human had great importance in contraception in some countries so many studies had been applied in human and laboratory animals, while the information about the comparative histology of domestic mammals’ ductus deferens is not adequate. The present study was undertaken to provide qualitative and quantitative comparative features of ductus deferens among Camel, donkey and dog. The lumen shape was mostly irregular in all parts of ductus deferens in all Animals. Longitudinal mucosal folds were found in the camel and dog, while the donkey had Finger-like folds. Lining epithelium was tall pseudostratified columnar epithelium with short stereocilia in the camel, simple columnar with long stereocilia and occasional basal cells in the donkey and pseudostratified columnar with short stereocilia in the dog. Epithelium height was highest in the second half of the straight part toward the ampulla. Tunica musculosa consisted of three lamina (less developed inner and outer longitudinal, and a well-developed middle circular). The inner longitudinal layer remained ill defined in camel, also in dog except the convoluted part, while in the donkey the trilaminar structure was prominent in the straight part only. Tunica serosa consisted of loose connective tissue having rich blood and nerve supply. It was variable thickest and in average was thickest in the camel and thinnest in the dog. Longitudinal smooth muscle bundles observed in camel only along the organ. It was concluded that the ductus deferens from different mammals revealed some species-specific characteristics. |