摘要:

Lung macrosections were mounted on photographic paper, with or without previous physiological expansion.

ISSN:1422-6405    

DOI:10.1159/000144859

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The chronology of branch pad development in fetal coronary arteries, their topographic and structural particularities as well as some observations on their evolution in succeeding age-groups are presented. A peculiar emphasis is given to the microarchitecture and functional significance of longitudinal muscle columns as a prevalent structural component of branch pads.

ISSN:1422-6405    

DOI:10.1159/000144860

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The effect of laser on the developing retinas of the rodents was studied. The visual cell layers and “the inner nuclear layers were involve

ISSN:1422-6405    

DOI:10.1159/000144861

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

To determine the fate of macrophages within the afferent lymph stream, the popliteal lymph nodes at various times (3 h to 6 months) after subcutaneous injection of india ink into the footpads of guinea pigs were examined. Two types of cells which had phagocytized india ink were observed in the germinal centers. A small number of type I phagocytes (engulfing india ink as small particles which were often found together with tingible bodies in their cytoplasm) were scattered through the germinal center. A large number of type II phagocytes (packed full of india ink) presented preferentially in the medullary portion of the germinal center, together with many pyroninophil lymphoblastoid cells. In the second experiment, the afferent lymphatics of the popliteal lymph node were ligated 15–20 min after india ink injection. Although the type I phagocytes were distributed as in the first experiment, the type II phagocytes were scanty. In the third experiment, the afferent lymphatics of the popliteal lymph node were ligated 7 days after india ink injection. The type II phagocytes disappeared rapidly from the germinal center, whereas the type I phagocytes remained and were not affected by ¾ n?. These results suggest that the type I phagocytes are the fixed macrophages or tingible body macrophages in the germinal center, and that the type II phagocytes are the macrophages migrating from the peripheral tissues. It was also shown that many macrophages reaching the regional node via afferent lymphatics entered the germinal center through the medullary pole where the cap of small lymphocytes became thinner or disappear

ISSN:1422-6405    

DOI:10.1159/000144862

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Immature pregnant mice treated with glucocorticoid hormone (triamcinolone hexacetonide) were killed 1 week following delivery. The epiphyseal growth plates of the humerus and their cellular constituents were analyzed quantitatively. It became evident that pregnancy per se evokes a marked suppressive effect upon young cartilage cells, thus interfering with the normal process of endochondral bone formation. Pregnant mice treated with glucocorticoid hormone experienced an even higher degree of chondrocytic derangement, however, to a lesser extent than chondrocytes of nonpregnant mice treated with the hormone. It therefore appears that pregnancy-induced elevation of systemic estrogens and progesterone provides some kind of a protection against the antianabolic activity of glucocorticoids upon chondrocytes.

ISSN:1422-6405    

DOI:10.1159/000144863

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Cytoarchitectural analysis of the telencephalon in Serranus scriba fish enabled us to differentiate a rather specialized morphological structure. Nerve cells identified in this structures cannot be classified following classical categories met in higher vertebrates neither be related to the isodendritic type of nonspecialized neurons. A centripetal orientation of dendrites and exons from all regions to the striatum is clearly expressed. Numerical prevalence of large cells is remarkable for similar structures in mammals in their prenatal and postnatal ontogenesis.

ISSN:1422-6405    

DOI:10.1159/000144864

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The pineal complex of rodents is made up of a pineal gland which developmentally always originates from the area between the habenular and posterior commissure and a pineal sac which is continuous with the choroid plexus of the third ventricle. At the light-microscopic level, this sac appears to be identical to the choroid plexus.The pineal sac abuts the deep and superficial pineal glands of the golden hamster. In the PET mouse, gerbil, kangaroo rat, and Chinese hamster, the sac is contiguous with only small areas of the pineal gland. This sac never abuts true pineal parenchyma in the albino rat. The variability of the relationship between this sac and pineal parenchyma indicates that the sac may not be the main physiological route of pineal secretion. Venous drainage of the pineal gland consistently seemed to be into the superior sagittal sinus by means of the vena cerebri magna.

ISSN:1422-6405    

DOI:10.1159/000144865

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

A limited fat-absorbing ability of the epithelial cells in the cecum and colon of mice was demonstrated light- and electron-microscopically. After injection of predigested donor fat into ligated segments of the large intestine and after massive gastric intubation of fat, fat droplets, predominantly of extremely large diameter, were visible in the cecum and colon. Comparison with fat absorption in the proximal and distal small intestine was undertaken. The large intestine, similar to the distal small intestine, is capable of absorbing lipids; however, the subsequent processing of fat appears considerably less effcient than in the proximal segments of the small intestine.

ISSN:1422-6405    

DOI:10.1159/000144866

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The wrist joint of lemuroid and lorisoid prosimians is examined in relation to variations among higher primates, particularly the specializations characteristic of hominoids. The lorisines Nycticebus and Perodicticus share a metrically defined primitive morphopattern with other prosimians and cercopithecine monkeys, showing little convergence on apes in carpal bone and distal radius and ulna shape.

ISSN:1422-6405    

DOI:10.1159/000144867

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

10 adult rabbits were arranged in five batches, 2 animals of nearly the same body weight in each group. 1 animal in each group was injected with vincristine sulfate whereas the other animal was similarly injected with the dissolving medium and used as a control. The animals were sacrificed 2 days after the last injection, and the areas containing the circumvallate and foliate papillae were examined. Injection of vincristine was followed by a decrease in number and in cell contents of vallate and foliate taste buds. Most of the taste buds which persisted after vincristine injection were full of necrotic debris which represented the remnants of degenerated cells. Possible reasons for degeneration of taste buds after vincristine injections were put forewards.

ISSN:1422-6405    

DOI:10.1159/000144868

出版商:S. Karger AG    

年代:1977

数据来源: Karger