共查询到20条相似文献，搜索用时 15 毫秒
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Von W. Künzel 《Anatomia, histologia, embryologia》1982,11(4):323-333
The ventricular systems of brains taken from 30 doges of various breeds were filled with the corrosion cast material, Technovit, photographed, and described in detail. As far as possinle NAV terminology was used. 相似文献
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In order to investigate the fine structure of the chicken's Bulbus olfactorius and to determine differences between birds and mammals, tissue specimen were taken from 26 animals. The following techniques were used: Luxol-Fast-Blue- and Nisslstaining, Bodian impregnation. Marked differences between the Bulbus of chicken and mammals were found lightmicroscopically in the number of the cell layers and the localization and size of cells. The electronmicroscope revealed that the cell organelles and the different types of synapses resembled the ones found in mammals. The mitral cells of the hen contrary to the ones of mammals often contained lamellar bodies. 相似文献
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The prenatal development of the bovine ruminal epithelium was studied with light- and electronmicroscopical techniques. During the period of the nonstratified epithelium a pseudostratified epithelium is found in the dorso-cranial part, whereas the other areas possess a one-layered epithelium, which is, like the pseudostratified epithelium, transformed to a multilayered epithelium from the 7th week onwards. From the 9th week the period of the stratified epithelium starts with the formation of the stratum profundum and stratum superficiale. First signs of keratinization are seen in the superficial cells from 2.3 months onwards. With 4 months fetal cornified cells can be identified, with 5.5 months a single-layered stratum basale is seen on the differentiating papillar connective tissue, and the superficial cells are transformed to balloon-cells. In suprapapillar areas, a stratum spinosum is formed at the prenatal age of 7.5 months. During epitheliogenesis a horizontal and vertical differentiation of the cells can be observed. The first one includes the differentiation of undifferentiated, embryonal cells to the basal cells of the stratum profundum, the latter the development of the basal cells to spinous cells and then to fetal cornified and balloon-cells. The ultrastructural changes during the process of keratinization were especially considered. 相似文献
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H. Jackowiak 《Anatomia, histologia, embryologia》1996,25(3):155-159
Microangioarchitecture of the mucosa of the Antrum pyloricum in rabbit was studied by optical and scanning electron microscopy. Passing the lamina muscularis mucosae, arteries of the submucosa reach the lamina propria and branch in to the terminal arteries forming a subglandular network. From these vessels, two capillary nets arise. The first forms a capillary skein around the base of the glands, while the second ascends along the tubuli, moving upwards to the surface along the glandular tubuli. These ascending capillaries also arise directly from the subglandular arterioles of the lamina propria, as well as from capillaries of the basal parts of the glandular tubuli. Subepithelial capillaries form arcuate loops with 2-3 venules or collecting venules, which run into the venous net in the basal region of the lamina propria. Numerous horizontal interconnections exist between the collecting venules but arteriovenous anastomosis in the mucosa was not observed. 相似文献
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C. Knospe 《Anatomia, histologia, embryologia》1998,27(4):219-222
The aim of the study was to answer the open questions concerning the development of the horse's testis. This study revealed that the seminiferous tubules originate from the sex cords of the coelomic epithelium and Leydig cells from the proximal part of mesonephric nephrones, whereas the rete and the ductuli efferentes derive from intermediate and distal parts of the mesonephric tubules. During the development the Leydig cells undergo an enormous proliferation due to the PMSG secretion in the mare. The proliferation of these cells prevent the deep penetration of the rete into the medulla and is therefore the reason for the reduced extension of the rete and mediastinum testis in the stallion, although 80% of these cells degenerate in the last third of pregnancy. The growth of the seminiferous tubules during sexual maturity reduces the rete to the extremitas capitata of the testis. 相似文献
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fifty-eight German landrace pigs were dissected and in 48 of these the relationship between thymus and the skeleton was determined. The 48 pigs formed four age groups: 12 Prenatal, 12 perinatal, 12 postnatal, and 12 slaughter-age animals. In 22 Pigs the blood vessels were injected with Neoprene, Tensol cement, Plastoid, or India Ink-Gelatin to study the vasscularization of the thymus. The result form the basis for the complete experimental removal fo the pig's thymus. 相似文献
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J. W. BARBER-LOMAX 《The Journal of small animal practice》1961,2(1-4):257-262
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Gerard Lemire 《Canadian journal of veterinary research》1942,6(12):349-351