摘要:

46 sternums originating from 1-day- to 17-year-old children were injected with India ink and transparified.The intraosteal and medullary vasculature is described at different stages, as well as cartilage canals, vessels of the isolated ossification center, vessels of the ossification center connected with peripheral vascular structures or neighboring cartilage canals, and finally the transition to the adult pattern. With age, the centrifugal vascular distribution develops to a centripetal pattern.

ISSN:1422-6405    

DOI:10.1159/000146552

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

In this work we separated homogeneous embryoid bodies (EB); this population is composed of only endodermal vesicles of a visceral type. These EB were used to immunize rabbits. After absorption, the antisera were analyzed immunohistochemically in sections of 7.5- and 9-day-old mouse embryos, which showed a selective reaction to visceral endoderm. The cytodifferentiation of the visceral endoderm was studied.

ISSN:1422-6405    

DOI:10.1159/000146553

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The present paper examines the results of quantitative assessment of intimal longitudinal smooth muscle (ILSM) in small arteries from normal mesentery in man. 212 vessels from 24 patients who underwent colectomy for colorectal carcinoma were studied. The mean amount of ILSM in these vessels was found to be 1.42% (range 0.00–8.90%) of external vessel diameter. A statistically significant (p = 0.018) positive correlation was demonstrated between the mean amount of ILSM in vessels from any individual patient and the level of diastolic blood pressure. It is concluded that increased intravascular tension is one factor which influences the development of ILSM in human small mesenteric arterie

ISSN:1422-6405    

DOI:10.1159/000146554

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

Ultrastructural images of some neurons and their synaptic connections, belonging to the nucleus of the periaqueductal grey substance in the domestic cat mesencephalon, are shown. The finding that some axosomatic synapses showed an open communication between the pre- and postsynaptic portion attracted our attention. In this way a continuity is made between the presynaptic bouton of one neuron (axon) and the postsynaptic portion of the other (neuronal soma). Synapses having these interneuronal communications could be denominated communicating synapses. Accepting Cajal’s neuron theory and his law of neuronal independence, it is very difficult to interpret these images. We wonder if this type of communicating synapses could be the exception that proves the rule of the neuron independenc

ISSN:1422-6405    

DOI:10.1159/000146555

出版商:S. Karger AG    

年代:1988

数据来源: Karger

ISSN:1422-6405    

DOI:10.1159/000146556

出版商:S. Karger AG    

年代:1988

数据来源: Karger