Abstract
The morphology, and histology of mammalian uterotubal junction have been extensively studied. Only a limited number of electron microscopic studies on this organ have been published. Furthermore, adequate data on the fine structure and ultracytochemistry of this organ are not available. Investigation of this subject, therefore, was initiated on the tubal junction of the intact prepubertal and ovariectomized rabbit to delineate changes induced by near physiologic levels of exogenous estrogen and progesterone. Experimental procedure is the same as reported previously.Two distinctive cell types, namely ciliated and secretory, are observed in the epithelia. The most obvious change after hormonal stimulation is the regeneration of cilia and basal bodies in the ciliated cells and the frequent extrusion of mucin-like granules into the tubal lumen (Figs. 1,3,4). Polysomal associations and fibrous granules are frequently seen in the cytoplasm of ciliated cells.
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