ISSN:1422-6405    

DOI:10.1159/000146652

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

A study of the internal surfaces of the seminal vesicle, coagulating gland, ampullary gland and ventral prostate of the golden hamster was carried out by scanning electron microscopy. The internal surface of each of these glands was found to display characteristic features in topography and in arrangements of the microvilli. The features are useful in the identification of these glandular tissues in situ.

ISSN:1422-6405    

DOI:10.1159/000146653

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

In the present communication, ultrastructural and cytochemical aspects of mature bovine Sertoli cells and their relationship to the different stages of germ cell development are described. As in other mammalian species, different types of junctional specializations exist between Sertoli and germ cells in the bovine seminiferous epithelium, including desmosome-like junctions, Sertoli cell ectoplasmic specializations and tubulobulbar complexes. The functional significance of the morphological results and the interactions of Sertoli and germ cells during spermatogenesis are discussed.

ISSN:1422-6405    

DOI:10.1159/000146654

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

Recent ultrastructural studies have revealed that there are differences in endothelial cell shape and cyto-skeletal architecture between the arterial and ventricular faces of developing semilunar valves. In the present work we have analyzed valvular endothelial cell response to taxol in the chick embryo. Following taxol administration, abnormal mitotic cells appear in the endothelium of both faces of the cusps. Interphase cells show few structural alterations. No differential response of the valvular endothelium to the drug was observed in the arterial or ventricular faces of the cusps.

ISSN:1422-6405    

DOI:10.1159/000146655

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The fine structure of epithelial cells of the small ventral prostate of Pseudomys australis males was studied. The cells were sometimes binucleated, exhibited relatively little granular endoplasmic reticulum, generally few secretory granules (probably reflecting a low proteinaceous secretory activity) but had abundant agranular endoplasmic reticulum (AER) similar to that in steroidogenic cells. Some of the mitochondria also showed tubular cristae. Furthermore, most cells had some irregular dense bodies in the cytoplasm which may have developed, by a gradual transformation process, from the membranes of AER, mitochondria and other organelles; they could be the product of degenerative changes in these organelles. These findings indicate a significant difference in the structure of these cells from those present in the ventral prostate of the hopping mouse, Notomys alexis. It is speculated that this gland secretes relatively little protein but perhaps more lipid or cholesterol-derived substance.

ISSN:1422-6405    

DOI:10.1159/000146656

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The macromolecular composition of sarcolemma and endomysium was studied by classical staining methods for glycosaminoglycans and using immunological techniques for proteins. Both proteoglycans and glycosaminoglycans (heparan sulphate, dermatan sulphate, chondroitin sulphate) could be detected in the sarcolemma. Type IV and type Vcollagen and laminin were found exclusively in the sarcolemma and endomysium. Type I and type III collagen as well as fibronectin were detected both in the endomysium and perimysium.

ISSN:1422-6405    

DOI:10.1159/000146657

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The patterns of silver affinity and following treatment with guanidine were studied in the basement membrane produced by parietal podocytes induced by corticoids in newborn rabbits. The goal of this study was to analyze the role of the different cell types of the renal corpuscle in the determination of the histochemical characteristics of the glomerular basement membrane (GBM). Jones’ method shows that while the GBM exhibited silver affinity only after periodic-acid oxidation, the basement membrane of parietal podocytes exhibits the same histochemical characteristics as the normal parietal basement membrane, appearing deep black both after periodic-acid or permanganate oxidation and after elastase or lysozyme digestions. Since the treatment with guanidine shows that the basement membrane of the parietal podocytes lacks the endothelial component typical of the GBM, it may be suggested that the special resistance to silver impregnation exhibited by the basement membrane after permanganate oxidation or after different enzymatic digestions is due to its endothelial componen

ISSN:1422-6405    

DOI:10.1159/000146658

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The ultrastructural morphology of the thoracic duct and cisterna chyli of the dog was examined using scanning and transmission electron microscopy. Examination of the cisterna chyli, reservoir of the lymphatic system, featured a number of afferent lymphatics draining into the cisterna; valves were however absent. The luminal surface of the endothelial lining of both the thoracic duct and cisterna demonstrated ovoid endothelial nuclei with numerous cellular ridges. Considerable variation existed in the number of smooth muscle cells lining the duct and cisterna in the contracted and distended state. Organelles and inclusions characteristic of endothelium and smooth muscle were identified. Reflux of lymph into the thoracic duct was prevented by a mono- and bicuspid valve situated at the lymphatico-venous junction.

ISSN:1422-6405    

DOI:10.1159/000146659

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The optic nerves of experimentally produced cyclopic and synophthalmic embryos of Gallus domesticus were studied to evaluate the course of the optic nerves in these abnormal circumstances. From this study it can be concluded that the course of the optic nerves appears largely to be a result of directional growth and that when decussation does occur in the optic chiasma, it results not from specificity as to side but from a tendency of outgrowing nerve processes to retain the direction of growth as fixed by axial orientation.

ISSN:1422-6405    

DOI:10.1159/000146660

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

Anatomical variations of the posterosuperior dural venous sinuses and, in particular, the absence or hypoplasia of one of them has been described in several studies. However, no recent detailed analysis on the subject exists. Cerebral venous thrombosis is quite often evoked, although rarely confirmed, when the physician is faced with patients having various neurological problems. In fact, for a number of cases the image interpreted as thrombosis is nothing but the total or partial absence of a dural sinus. It was considered of interest to undertake an anatomical study in order to define these variations. The results of anatomoradiological investigations of 70 fresh cadavers were compared to those obtained by angiographic examination of 100 patients not suffering from any kind of venous pathology (patients explored angiographically for glioma, meningioma or aneurysm). Our conclusions and a review of the embryology literature enabled us to demonstrate that a number of radiological findings, quite often considered pathognomonic of venous thrombosis (i.e. ‘delta sign’), are in fact the result of anatomical variati

ISSN:1422-6405    

DOI:10.1159/000146661

出版商:S. Karger AG    

年代:1988

数据来源: Karger