ISSN:1422-6405    

DOI:10.1159/000145339

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

Origin, diameter and right-left differences of the cortical rami of the middle cerebral artery were examined in 101 hemispheres. Included are also the length, diameter and the types of furcation (bifurcatio, trifurcatio, quadrofurcatio).

ISSN:1422-6405    

DOI:10.1159/000145340

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

On 820 human brains the presence and the course of the striae medullares of the fourth ventricle were investigated. The quantity of the various forms was studied; in 40% of cases a symmetrical and in 60% an asymmetrical situation was seen. 34 different forms were described.

ISSN:1422-6405    

DOI:10.1159/000145341

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

The litter effect among natural litters (with minimal differences in size i.e. 6, 8 and 9) on the growth was studied in CF rats from post-conception (PC) day 22 to 90 by somatometric techniques. Body weight was found to be significantly low in larger litters up to PC day 50 although the difference persisted numerically until PC day 90. Crown-rump length, tail length and patellocalcaneal length were significantly ( < 0.001) reduced in larger litters. Growth rate curves substantiated these observations. Since the differences in size among the three groups of litters were too small to cause any nutritional deprivation and the natural potential for growth was not altered, differences in mother-offspring and/or offspring-offspring emotional interactions could be the possible factor responsible for the growth rate differences.

ISSN:1422-6405    

DOI:10.1159/000145342

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

Circadian variation in the structure of mast cells has been demonstrated histologically. At 11.00 h the number of mast cells was increased and at 03.00 h it was significantly decreased (p < 0.01). Morphological analysis has also supported this phenomenon.

ISSN:1422-6405    

DOI:10.1159/000145343

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

The histology and cell types of the islets of Langerhans were studied in the Mongolian gerbil during post-natal development using granule stains, fluorescence methods and electron microscopy. Relative islet volume, islet size distribution, islet-duct association, islet-fat association, α- and D cell populations and the size distribution of secretion granules in islet cells were quantified. In adult gerbils islets have an elliptical profile enclosed by a thin collagenous capsule, a central core of β-cells, a peripheral shell of α-cells and an incomplete layer of D cells between. In animals of 1 week or less, islets lack a capsule, are poorly vascularized and not innervated, though α-, β- and D cells are present. α-Cells exhibit green fluorescence during these early stages that disappears when adrenergic nerve fibres grow into the islets. Electron microscopy shows a fourth (unidentified) granular islet cell type, and small granular cells, that probably correspond to intensely fluorescent cells, were found within islets and neuroinsular comp

ISSN:1422-6405    

DOI:10.1159/000145344

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

A comparative histological and microradiographic study of the tibial epiphyseal plates of chickens raised on: (1) a vitamin-D-deficient diet; (2) a vitamin-D-deficient diet supplemented with cholecalciferol, and (3) a vitamin-D-deficient diet to which extra calcium had been added, has revealed that a high-calcium diet did not normalize the epiphyseal plates completely. However, it restored the normal length and chondrocyte arrangement to the proliferative zone. The degenerative zone became elongated and this seems to be related to the hypophosphataemic condition which has developed as a result of the special diet.

ISSN:1422-6405    

DOI:10.1159/000145345

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

In the vaginal epithelium of mice given 5 daily injections of 100 µg 5α-dihydrotestosterone from the day of birth, highly electron-dense cells with numerous cytoplasmic processes appeared in the basal layer within 35 days after the last injection. These cells were similar to the B cells reported in earlier works in neonatally estrogen-treated mice undergoing ovary-independent, permanent proliferation and cornification. The present electron-microscopic study suggests that the permanently proliferating, highly electron-dense cells are derived from electronlucent cells (clear cells) appearing in the basal layer of the vaginal epithelium 15–20 days after neonatal androgen treatm

ISSN:1422-6405    

DOI:10.1159/000145346

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

The testicular seminal pathway in the camel is divided into two portions: an intratesticular and an extratesticular portion. The intratesticular seminal pathway consists of three portions: a ‘tapering terminal segment’ of the seminiferous tubules opening into the receptacle, the tubuli recti with three parts and the rete testis. The extratesticular portion consists of the rete testis, as an extension of the intratesticular portion and an elongated sac from which 6–7 ductuli efferentes originated. The tapering terminal segments are lined by modified Sertoli cells. Both, the tubuli recti and rete testis, are lined by simple cuboidal to columnar cells. The epithelium of the ductuli efferentes which, at its origin from the sac is simply cuboidal, gradually changes to an epithelium that consists of alternating groups of high-columnar ciliated and low-columnar non-ciliated cells. The strongly PAS-positive basement membrane of the ductuli efferentes is surrounded by a thin circular layer of smooth muscle fibres. The pseudo-stratified columnar epithelium of the epididymis is supported by an intensely PAS-reactive basement membrane. Morphological changes in the epithelium of the head and body regions of the epididymis due to seasonal variations are well marked in the camels of all age g

ISSN:1422-6405    

DOI:10.1159/000145347

出版商:S. Karger AG    

年代:1980

数据来源: Karger

摘要:

The monoaminergic innervation of the coronary vessels and of the myocardium in dogs was examined by means of degenerative techniques: (i) local perivascular neurotomy was performed at the origin of the left coronary artery; (ii) the stellate ganglion was removed bilaterally. Evaluation of the neural degeneration pattern led the suggestion that three types of neurons at least exist within the heart: (i) neurons innervating the coronary vessels both in the ventricles and in the atria; (ii) neurons innervating the ventricular myocardium, and (iii) neurons innervating the atrial myocardium. The post-ganglionic fibres of the stellate ganglion innervate the vessels of the whole heart. Their contribution to the innervation of the ventricular myocardium represents about 30%.

ISSN:1422-6405    

DOI:10.1159/000145348

出版商:S. Karger AG    

年代:1980

数据来源: Karger