Histological, ultrastructural and histochemical study on the postanatal development of proximal and distal portions of the small in male rabbits (oryctolagus cunculus

الملخص EN

JisuIogieal, ultraslrucrural and liislochemieal smdies were conducted on the small intestine of 50 Blanc do Bouscat maJe rabbits; the age varied between 0-30 days.

The result showed that the progress in age has a pronounced effect on the shape and length of the intestinal villi of the small intestine.

The mucosa of the small intestine was lined by simple striated columnar epithelium with prominent goblet cells.

The crypts opened adjacent in the bases of the villi as simple, branched tubular invaginations, Ihc mucosa of the small intestine was covered by columna' cells thai contained apical microvilli, ova* nucleus, dilated cistern at- of rough endoplasmic reticulum.

Golgi apparatus, vacuoles and electron dense material in all age groups.

The crypts showed some epithelial cells with dilaied intercellular spaces and contained apical microvilli, mitochondria, granules with electron dense material, rough endoplasmic reticulum and elongated nucleus.

There were a few cells with spherical secretory granules of different size above the nucleus and other cells of polymorphic secretory granules of different sizes beneath and lateral to the nucleus.

Positive reaction to PAS diastase resistant material and diastase-digested material (glycogen) was clearly seen in the surface and crypts epithelial cells of different ages.