摘要
In order to compare the ultrastructure and secretory cytology between turtle and hen,we used the uterovaginal junction(UVJ) of hen and isthmus segment of turtle oviduct.The sperm storage tubules(SSTs) in the turtle were mainly localized in the isthmus part of oviduct while,in hen the UVJ had abundance of these tubules.Ultrastructuraly,the epithelium of UVJ in hen and isthmus in turtle was lined with ciliated and secretory cells.In UVJ of hen epithelial ciliated cells were characterized with light and dense secretory granules in supernuclear cytoplasm.Dense secretory granules in ciliated cell of UVJ epithelium were larger in size,surrounded with transparent rim and concentric layers.The secretory cells of UVJ were associated with the release of secretions via apocrine blebs from microvilli.The dense secretory granules in these cells were smaller in size,absence of transparent rim or layers and were released in the lumen through secretory vesicles.In SSTs of UVJ,secretory and ciliated cells with the presence of both dense and light granules span the entire epithelium.The dense secretory granules in ciliated cells of SSTs were smaller in size in comparison to epithelium of UVJ and characterized with the absence of both circular layer and transparent rim.The cytological distribution of the cells in the hen were more or less similar to that seen in the oviduct of turtle as the both ciliated and secretory cells present the entire epithelium and these epithelial cells were involved in secretions.Ciliated cells of UVJ and isthmus were also involved in the shedding of exosomes and secretory vesicles in the lumen.The intracellular multivesicular body(MVB) was also observed in supernuclear cytoplasm of secretory cells in UVJ,which is related to the production of exosomes.In general the apical protrusion of epithelium in the form of apocrine secretions,the releasing of exosomes,the identification of intracellular MVB and releasing of dense granules gives the epithelium distinct nature and more resemblance to the turtle oviduct.
In order to compare the ultrastructure and secretory cytology between turtle and hen,we used the uterovaginal junction(UVJ) of hen and isthmus segment of turtle oviduct.The sperm storage tubules(SSTs) in the turtle were mainly localized in the isthmus part of oviduct while,in hen the UVJ had abundance of these tubules.Ultrastructuraly,the epithelium of UVJ in hen and isthmus in turtle was lined with ciliated and secretory cells.In UVJ of hen epithelial ciliated cells were characterized with light and dense secretory granules in supernuclear cytoplasm.Dense secretory granules in ciliated cell of UVJ epithelium were larger in size,surrounded with transparent rim and concentric layers.The secretory cells of UVJ were associated with the release of secretions via apocrine blebs from microvilli.The dense secretory granules in these cells were smaller in size,absence of transparent rim or layers and were released in the lumen through secretory vesicles.In SSTs of UVJ,secretory and ciliated cells with the presence of both dense and light granules span the entire epithelium.The dense secretory granules in ciliated cells of SSTs were smaller in size in comparison to epithelium of UVJ and characterized with the absence of both circular layer and transparent rim.The cytological distribution of the cells in the hen were more or less similar to that seen in the oviduct of turtle as the both ciliated and secretory cells present the entire epithelium and these epithelial cells were involved in secretions.Ciliated cells of UVJ and isthmus were also involved in the shedding of exosomes and secretory vesicles in the lumen.The intracellular multivesicular body(MVB) was also observed in supernuclear cytoplasm of secretory cells in UVJ,which is related to the production of exosomes.In general the apical protrusion of epithelium in the form of apocrine secretions,the releasing of exosomes,the identification of intracellular MVB and releasing of dense granules gives the epithelium distinct nature and more resemblance to the turtle oviduct.
引文