Морфологія (Jan 2009)
Formation of neuro-glio-capillary relation in neurohypophysis on different stages of postnatal period of ontogenesis
Abstract
Although the row of works is devoted to ontogenesis of hypophysis, a question on what stage of ontogenesis hypothalamic-neyrohypophysal system starts its functions is rather controversial and needs subsequent study. Therefore, our purpose was to research the patterns of becoming neyro-glio-capillary correlations of the posterior lobe of hypophysis on the stages of postnatal ontogenesis. The material for research were the pieces of neurohypophysis of 40 white purebred rats of males in age: new-born, 7, 45 and 90 days after birth. At the fence of material for electron microscopic research the generally accepted rules of speed of carving are observed and not traumatic. The research of ultrastructure of neurohypophysis of white rats showed that on the first week of their life the amount of axon-vessel synapses and neurosecretory granules had increased, among which a zonality of situation of different types of them is observed, that testifies to completion of neurosecretory structures formation. Submicroscopic structure of sinus capillaries in this term specifies on their high functional activity, in particular, about an enhanceable transendothelial transport. Thus, our research allows to draw a conclusion, that already dur-ing the first week of life in the structure of neurohypophysis of rats substantial high-quality and quantitative changes take place, which testify to completion of becoming of its neurosecretory structures and on later stages of postnatal development they are only perfected.
