ELECTRON MICROSCOPY OBSERVATIONS ON THE POSTERIOR LOBE OF THE PROSTATE GLAND IN RABBITS

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Abstract
Thefine structure of the epithelium in the posterior prostate lobe of the rabbit has been investigated This gland has a serous secretion which also contains large amounts of fructose. The cytochemical study has demonstrated the presence of ribonucleoproteins. Only one type of cell has been observed in the epithelium. The fine structure of the glandular cells is characterized by a well developed, lamellar and vesicular, granulated endoplasmic reticulum and a large Golgi apparatus the vac-uoles of which often contain dense, homogenous, eccentrically placed granules. Vacuoles with granules have been observed outside the Golgi complex. The ground cytoplasm contains large amounts of free ribosomes arranged in rosette formations. Cyclic changes in the epithelium have been observed. The cell apex, in certain stages of this secretion cycle, is filled with vacuoles with varying contents, possibly secretions in different maturation stages. The formation of the secretion is also discussed. It has now been established that true basal cells do not occur.