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At early embryonal and larval stages of development 7 species of amphibia have been studied. The ultimobranchial anlage and processes resulted in formation of the secretory follicle are investigated. Dynamics on changes of amount of the gland cells and the first appearance of capillaries are analyzed. In Anura and Urodela the anlage of the ultimobranchial(More)
The histological structure of the brain and spinal cord, visual, olfactory, auditory and vestibular analysers, and endocrine organs (epiphysis, hypophysis, thyroid and parathyroid glands) were investigated in newborn rats delivered by females who had been exposed to weightlessness a half of the pregnancy period. Analysers of the flight animals did not have(More)
In experiments with rats effects of hypokinesia on the course of pregnancy and the mother-fetus system were investigated. Immobilization in penal-type cages of female rats on days 8 through to 19 of pregnancy gave rise to significant shifts in mother's organism, i.e. retarded body mass gain, mass reductions in thymus, spleen, liver, some other organs, and(More)
Formation and differentiation of calcitonin-secreting cells has been studied in human embryos. The cells form from the entodermal part of the rudiment of the last pharyngeal cavity. They do not secrete calcitonin before incorporation into the thyroid gland. The first calcitonin-secreting cells appear in the thyroid gland as a diffuse net. The properties and(More)
The visceral and somatic skeleton of Pleurodeles waltilii was investigated after a series of two-week space flights on the biosatellites. It was shown that under conditions of weightlessness osteoporosis of the skeleton and its demineralisation were stimulated. In weightlessness, calcium, phosphorus and sulfur were lost and potassium accumulated. Trabeculae(More)
C-cells of Pleurodeles waltilii ultimobranchial bodies (ULT) were studied after a series of two-week spaceflight on the biosatellites. It was shown that under conditions of weightlessness the hypertrophy of ULT and calcitonin secretion activation occurred. Calcitonin accumulated into the ULT which resulted in metaplasia of the surrounding tissues, organ(More)
Portions of homologous neuroepithelium of various length were introduced into the neural tube cavity in Rana arvalis and Pleurodeles waltlii late neurula. The neural tube in R. arvalis was destroyed independently of the transplant length. In P. waltlii neural primordia were deformed if a large transplant prevented closing of the neural tube. Redundant(More)