摘要:

The gross and microscopic anatomy of the biliary tract of the ferret was studied. The liver consisted of six separate lobes. The coronary ligament was not present. Histologically, it was very similar to that of man. The gall-bladder was present and was a pear-shaped sac. Its muscle coat was very thick and well developed. Hepatic ducts were multiple. Minor hepatic ducts formed three major ducts, the left, central and the right. A single common hepatic duct was not present. The cystic duct generally arose from the central duct. The bile duct was formed by the union of three major hepatic ducts. The pancreas consisted of two limbs, the left and the right. Each limb was drained by a duct which joined and formed a short main pancreatic duct. An accessory pancreatic duct extending from the duct of the left limb of the pancreas was usually present. The main pancreatic duct joined the bile duct nearly at right angles prior to the entry into the duodenum. Both ducts entered through the same osteum and coursed together. They ended in a common ampulla which opened into the major duodenal papilla situated at about 2.75 cm from the pylorus. The sphincter of Oddi was present and was very similar in disposition to that of man. The sphincter choledochus (of Boyden) was well developed. An accessory pancreatic duct was usually present. It opened into the duodenum at a minor papilla which was not prominent. The minor papilla was situated proximal and medial to the major papilla. Mast cells were not seen in the connective tissue sheaths of the liver, gall-bladder and pancreas.

ISSN:1422-6405    

DOI:10.1159/000144725

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

By combination of light, electron-microscopical and histochemical findings in the myocardium of dog and mice, the hypothesis of an intimate contact between a widely branched interstitial cell type, rich in proteoglycans, and myocardial cells could be strengthened. The branches seem to penetrate the transversal tubular system of the myocardial cells. Functionally, this interstitial (mast cell-like) cell type might influence via proteoglycans – delivered into the transversal tubuli – the excitation phenomena of the myocardial cell membrane. One of the earliest pathomorphological changes in the myocardium, as revealed by the light-microscope, is the disengagement of these interstitial cells and the myocardial cells. From this point of view the genesis of myocardial cell necrosis has been discus

ISSN:1422-6405    

DOI:10.1159/000144726

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The epithelium of the female reproductive tract undergoes cyclic morphologic alterations in cell shape, apical microvilli, ciliation, and secretion. These changes are hormone-dependent. The endometrial fluid is made of (a) components from the transudation of the blood serum and (b) protein, carbohydrate and other metabolites synthesized within the endometrial cells and discharged through the apical cell membrane. Endometrial cells have several mechanisms of transport processes across the plasma membrane. These processes regulate cellular volume, nutrition, excretion and communication along the surface of the cell as well as the intra-cellular and extracellular communication. The endometrial secretions play a major role in the capacitation of spermatozoa, and the nutrition of the blastocyst.

ISSN:1422-6405    

DOI:10.1159/000144727

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Air-dried rabbit blood was stained by HE, PAS and a modification of the Undritz II method. Eosin stained granules red in the eosinophil leukocytes. PAS was negative and the modified Undritz method failed to give consistent results. Cells with eosinophilic granules appeared in the corneal stroma 1 h after removing the corneal epithelium. They were stained red consistently by both eosin and the modified Undritz method. Electron micrographs failed to demonstrate crystalloids in their granules. Because of the staining characteristics and the lack of crystalloids in their granules these cells were classified as pseudoeosinophil leukocytes. The electron micrographs showed some glycogen 12 h after denuding the cornea, however, glycogen was not well stained by PAS until 18 h after denuding.

ISSN:1422-6405    

DOI:10.1159/000144728

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

In order to determine the intrinsic (genetic) and extrinsic (functional) parts of the naturally ankylosed tooth, a qualitative study of the development and fate of tooth buds transplanted individually or within the premaxilla was carried out. These teeth were transplanted as autografts during crown formation. They were placed in either the anterior chamber of the eye or in a dorsal subcutaneous site. Most of the 163 transplants survived and were examined at intervals from 0 to 180 days by gross, histologic and microradiographic methods. Tooth buds transplanted with or without the premaxilla were capable of growth to normal size and shape. Lack of underlying bone with which to ankylose and lack of normal oral environment and function did not prevent formation of a normal-sized root area. The root area was composed of dentin and covered by a solid, undisrupted Hertwig’s epithelial root sheath which appeared to mold the root. Calcified tissue formed on the outside surface of dentin only when the root sheath was accidentally torn during transplantatio

ISSN:1422-6405    

DOI:10.1159/000144729

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Multivariate statistical analysis, based upon a number of dimensions, showed significant contrasts in dental arch form between four primate groups, which was difficult to identify from subjective visual inspection. Furthermore, analysis of dental arch size was shown to differ from dental arch shape, although whether this reflected predominantly genetic or environmental factors, requires further research.

ISSN:1422-6405    

DOI:10.1159/000144730

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

According to ‘antagonistic compensation’, appendicular bones rendered hypofunctional by surgical means, become shorter and more robust. In normal Buffalo rats, appendicular bones are short and very robust and in Fisher rats they are long and gracile. Total body constitution is robust in Buffalo rats and gracile in Fisher rats. In GRL rats, appendicular bones are short but body constitution is gracile and the robusticity of the appendicular bones is intermediate between Fisher and Buffalo rats. Thus, total body constitution and relative length of the appendicular bones determine their robusticity, shorter bones being more robust than longer bones. In other words, the relationship between bone length and robusticity is the same in experimentally produced antagonistic compensation and genetically determined normal condition of r

ISSN:1422-6405    

DOI:10.1159/000144731

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Young mice were treated for up to 8 weeks with daily graded doses of triamcinolone diacetate. The body weights of treated, placebo and nontreated animals were measured daily throughout the experimental period, calculated and analysed. By the first injections, significant decrease was noted in the body weight of all experimental mice regardless on their sex or initial body weight. The latter was followed by a so-called ‘steady state’ which longed for approximately 4 weeks. Marked deterioration and mortality also occurred but became severe from the fifth week of triamcinolone administration. Possible explanations for the above findings are discus

ISSN:1422-6405    

DOI:10.1159/000144732

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

Regarding the different stainability when using the Luxol fast blue method, two kinds of Purkinje cells of the rat are described: Luxol-positive and Luxol-negative cells. Since, by this method, phospholipids are demonstrated, the author suggests the prospective varying functional condition of these cells. Different tinction of Purkinje cells has been confirmed also by other methods (gallocyanin-chromalaun, thionine, toluidine blue, lithium-haematoxylin, chromalaun-haematoxylin-phloxine and acid phosphatase) in both animal and human material. After 96 h of immobilization the different stainability of Purkinje cells becomes more marked, which phenomenon can be as well explained with regard to the functional point of view. Similar differences, though less marked, were found also in neurosecretory cells of the nucleus supra-opticus of the rat and in the nuclear region of the ganglion semilunare Gasseri cells in man. Finally, the author refers to the relations between the Luxol blue staining method and Baker’s method employing acid haematoxylin for demonstration of phospholipids in certain kinds of nervous system cells, taking into consideration Kroon’s findi

ISSN:1422-6405    

DOI:10.1159/000144733

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

A fine-structure study of the parathyroid proper and adjacent tissues has been performed in the gerbils. The chief cells were observed in three phases of the secretory cycle. The resting chief cells contained prominent lipid droplets, mitochondria and an atrophied Golgi apparatus in a finely granular cytoplasm. The intermediate-phase chief cells were also rich in lipid but showed an organelle assembly which is much less developed than in the actively secreting cells. The active chief cells possessed a noncisternal rough endoplasmic reticulum, located often in close proximity of the mitochondria. A prominent Golgi apparatus, numerous pro-secretory granules and lysosomes are characteristic of the active cells. The significance of these morphological variations is discussed. Large mitochondria-rich cells, akin to oxyphil cells were observed in the tissue adjacent to the parathyroid proper.

ISSN:1422-6405    

DOI:10.1159/000144734

出版商:S. Karger AG    

年代:1977

数据来源: Karger