Archives d'anatomie, d'histologie et d'embryologie normales et experimentales最新文献

In this work the morphological types of the nervous receptors in the pulmonary vessels of the Wistar rat are studied with the Koelle-Friedenwall, Champy-Maillet and Jabonero techniques. Different types of corpuscules are described. Some are simple and some are more complex (tree-like terminals of Seto type). The localization of these corpuscules is variable. Sometimes they are located in the pulmonary vessels and sometimes in the conjunctive tissue. These receptors are interpreted as baro-receptors i.e. receptors of change of pressure.

The ultrastructural features of the interrenal cells have been studied in 20-days-old chick embryos following the administration of adrenocorticotropin (ACTH), on the 8th or 15th day of incubation. The interrenal cells of normal embryos contain more SER than RER, mitochondria with tubular cristae, lipid droplets and Golgi complex. Adjacent cells had numerous regions of pentalaminar fusion and intermediate junctions. Neither a precise organization of medullary tissue in relation to interrenal tissue nor any structural differences between interrenal cells were found. Changes in the fine structure of the interrenal cells following ACTH treatment were extensive. The organelles that are known to be involved in the biosynthesis of steroids displayed structural modifications. These were mainly SER, mitochondria, and lipid droplets. Changes were also noticeable in the Golgi complexes, membrane-bound dense bodies (especially in 15 days treated embryos). These results indicate the well developed organelles in the interrenal cells of 20-days-old embryos, and their capacity to respond to ACTH stimulation as early as the 8th day of embryogenesis.

The parieto-occipital artery, angular artery or "du pli courbe" artery was injected with Batson's resin, and thus it was possible to study its point of origin, diameter, length and superficial course. An assessment was made of the possibility of this vessel functioning as receptor artery in the surgical anastomoses between the superficial temporal artery and cortical branches of the middle cerebral artery in the cerebral revascularization neurosurgical technique.

The oviducts of Hemidactylus flaviviridis exhibited seasonal changes and their enlargement coincided with a gradual increase in the size of the ovaries. During the breeding season (April) the oviductal wall was lined by tall, columnar epithelium which consisted of flask-like ciliated and nonciliated cells. The epithelium reacted strongly with PAS and Sudan Black-B and exhibited delta 5-3 beta-hydroxysteroid dehydrogenase (delta 5-3 beta-HSD) and Glucose-6-phosphate dehydrogenase (G-6-PD) activity indicating that the oviducts of this lizard might be involved in the steroid metabolism. In the nonbreeding lizards the oviduct showed degeneration marked by the reduction in the size and height of the epithelium which contained Sudan Black-B but not PAS positive granules. It also lacked delta 5-3 beta-HSD and G-6-PD activity. Ovariectomy resulted in decreased activity of the oviduct. When the specimens having small, previtellogenic ovarian follicles and regressed oviduct were treated with FSH alone or with a combination of FSH and LH, the epithelium of the oviduct showed stimulatory changes as indicated by the increased epithelial cell height and high delta 5-3 beta-HSD and G-6-PD activity. By contrast, LH alone remained without marked effects.

The study of human scapula dimensions is carried out on 110 scapulas of european adults. The statistical analysis of the results concerning the maximum height of the scapula, as well as those of the supraspinous and infraspinous fossa, and also the medial angle, show the absence of statistically significant difference between right and left sides.

With the purpose to show a possible sexual difference in the evolution of the juxtaglomerular granular cells during the albino rat post-natal development, the authors have compared groups of male and female animals of crescent ages from 2 to 90 days old. During the first 30 days, the granulation indexes, which express the secretory activity of the Ruyter cells, are regularly increasing as the body and renal weights. On and after the 30th day, the growth becomes more important for males than for females but, in spite of these weight differences, the granulation indexes are not significantly different in terms of sex, at the same age. In order to control these results, castrations have been performed during the period of granular cells increase, on the 17th day of life. The comparison of castrated and uncastrated animals on the 35th day shows that castration causes repercussions on the body and renal growth. On the other hand, no significant modification of the granulation indexes occurs, which brings the demonstration that the Ruyter cells development is independent of the animal sex.

The utero-tubal junction morphology has been analysed by means of the uterus and tubes study of 37 human foetuses and new-born infants between the 15th gestational week and the 3rd life week. Being difficult to identify it before the 20th gestational week, it is possible to recognize the uterotubal junction by the muscular fibers traject, as well as by the arrangement of the reticuline fibers and mesenchymal cells of the submucosa. During the previously reported period we haven't observed any sphincterian structure at the utero-tubal junction level; thus, we believe that the closure mechanism is purely functional one.

The various types of sensory nerve endings found in the peroneus tertius muscle in the ass and in the horse have been studied with Ruffini's gold chloride method. Free nerve endings have been described as well as encapsulated receptors. These corpuscles are classified as Pacini-like, Ruffini's terminations and also Golgi's tendon-organs. The authors have pointed out the morphology, topography and structural characteristics of the above named nervous terminations and have hypothesized that a probable functional relation existed between these nervous corpuscles and the considered tendinous structure.

Administration (i.m.) of metopirone (2.5 mg/frog/day for 10 days) to adult male frog, R. cyanophlyctis, resulted in marked degranulation and hypertrophy of B3 cells and a moderate degranulation of B2 cells of the pars distalis. Concomitantly, there was hypertrophy of the interrenal cells and regression of the Leydig cells, however spermatogenesis was not affected. The results suggest a functional correlation between pituitary B cells and the interrenals in R. cyanophlyctis.

The tela choroidea of the prosencephalon in cat is vascularized by an anterior choroidal artery arising from the carotid system and by a posterior choroidal artery arising from the vertebral basilar system. The first essentially supplies the tela and the choroid plexus of the lateral ventricle. The second above all supplies the tela choroidea of the third ventricle. Both, the anterior and posterior choroidal arteries anastomose with their terminal branches. The choroidal branches which arise from these arteries nourish the capillary networks of the tela. These vessels drain into venules and veins which are tributary of the venous circle of the base and of the internal cerebral veins.