Results 141 to 150 of about 12,257 (184)

Morphogenesis of extraembryonic membranes and placentation inMabuya mabouya(Squamata, Scincidae)

Journal of Morphology, 2003
AbstractTopological and histological analyses of Mabuya mabouya embryos at different developmental stages showed an extraembryonic membrane sequence as follows: a bilaminar omphalopleure and progressive mesodermal expansion around the whole yolk sac at gastrula stages; mesodermal split and formation of an exocoelom in the entire embryonic chamber at ...
Adriana Jerez, Martha Patricia Ramírez‐Pinilla   +1 more
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Radioautographic studies of DNA synthesis in the developing extraembryonic membranes of the mouse

The Anatomical Record, 1967
AbstractTritiated thymidine was injected into pregnant BALB/c mice intravenously at 8, 10, 12, 14 and 16 days of pregnancy. Radioautographs were prepared in order to determine the extent of synthesis of DNA in the extraembryonic membranes at the above stages of gestation. The extent of synthesis of DNA was expressed as a radioactive index. The index is
Frank M. Saccoman, Charles Morgan, L. J. Wells   +2 more
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Paternal X chromosome expression in extraembryonic membranes of XO mice

Journal of Experimental Zoology, 1979
AbstractThe paternally derived allelic form of the X chromosome linked enzyme phosphoglycerate kinase (PGK‐1) is expressed in both the fetus and extraembryonic membranes of 9.5 day post coitum XO (XPO) mouse conceptuses. Previous studies on trophectoderm and primitive endoderm derived extraembryonic membranes in XX conceptuses suggest expression of ...
William I. Frels, Verne M. Chapman
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Embryology of the sheep. I. Extraembryonic membranes and the development of body form

Journal of Morphology, 1972
AbstractThe developmental anatomy of the sheep in the early prenatal period (14 to 34 days) was studied using embryos of known coital age, and embryos of known size with estimated coital age. Characteristics of the embryos were studied by gross observation under the dissecting microscope, and by means of serial sections.
M. M. Bryden, Howard E. Evans, Wayne Binns   +2 more
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Early prenatal diagnosis; A study of biopsy techniques and cell culturing from extraembryonic membranes

Clinical Genetics, 1974
The study concerns the diagnosis of fetal condition early in pregnancy ‐ within the first trimester. An instrument was designed to allow biopsy of the extraembryonic membranes under visual control. The instrument was tested in 95 pregnant women prior to legal termination of pregnancy.
Niels Hahnemann
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Histology of the extraembryonic membranes of an oviparous snake: Towards a reconstruction of basal squamate patterns

Journal of Experimental Zoology Part A: Comparative Experimental Biology, 2003
AbstractAn understanding of the evolutionary morphology of extraembryonic membranes in reptiles requires information about oviparous as well as viviparous species. We are studying histology and ultrastructure of the extraembryonic membranes of snakes to clarify the evolutionary history of reptilian fetal membranes, including determination of basal ...
Daniel G. Blackburn, Amy R. Johnson, Jennifer L. Petzold   +2 more
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Expression of Calcium Transport Proteins in the Extraembryonic Membranes of a Viviparous Snake, virginia striatula

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, 2012
ABSTRACTYolk is the primary source of calcium for embryonic growth and development for most squamates, irrespective of mode of parity. The calcified eggshell is a secondary source for embryonic calcium in all oviparous eggs, but this structure is lost in viviparous lineages.
Santiago P. Fregoso, James R. Stewart, Tom W. Ecay   +2 more
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Fur1ctions of extraembryonic membranes

, 1990
Abstract Several extraembryonic membranes arc interposed between the postimplantation mammalian embryo and the maternal tissue, and these subserve a variety of functions which together provide a well-regulated environment for embryo growth and development.
Stuart J. Freeman
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Development of the extraembryonic membranes and histology of the placentae in Virginia striatula (Squamata: Serpentes)

Journal of Morphology, 1990
AbstractDevelopment of the extraembryonic membranes and their structural alignment in the formation of the four placental categories that occur in Virginia striatula is similar to that of other Serpentes. The vascularized trilaminar omphalopleure contacts the uterine epithelium early in development to form the choriovitelline placenta, which ...
James R. Stewart
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Ultrastructural and cytochemical studies of the extraembryonic membranes of the rat

, 1967
Reid S. Connell
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