الفهرس 
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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.