چكيده لاتين :
Due the fact that during estrus cycle the genital organs are affected by female reproductive hormones, the physiologic changes more likely will reflected in structural alterations of genital organs.For determination of histological changes during estrus cycle, 20 genital organs from 4-8 years old buffalos were collected from abattoir and 10 specimens were appointed to each phases of estrus cycle. The tissues were stained with H&E, PAS, Verhoeff, Toluidine blue and Van Geissonʹs methods, respectively for general histological study, carbohydrate, elastic fibers, mast cells, and collagen fibers. Mucosal epithelium was simple columnar and some cells were ciliated and some others recognized by extensive and clear cytoplasm. Epithelium in follicular phase contained PAS positive granules more than the leuteal phase. Collagen fibers revealed more in deep region of mucosa-submucosa and between bundles of muscles. Elastic fibers were observed in connective tissue of tunica muscularis and around of blood vessels. Mast cells were observed in mucosa-submucosa and tunica muscularis. We conclude that; the epithelium of uterine cervix in follicular phase of estrus cycles has secretory activity. The structural firmness and solidity of this organ most probably is due to presence of collagen fibers in mucosa- submucosa layers. More likely, the mast cells involving in histological changes of the cervix during estrus cycle.
