Results 171 to 180 of about 8,634 (234)

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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Somatic polyploidy in extraembryonic membranes of the snake,Elaphe guttata

Protoplasma, 1993
Video-densitometric DNA measurements of Feulgenstained tissues of 42 day old eggs of the corn snake,Elaphe g. guttata (Columbridae, Serpentes), revealed a basic DNA content of 2C=2.17 pg, with somatic polyploidy in the allantois, the chorioallontois, the yolk sac, and other extraembryonic membranes.
Robert Meyer, Walter Nagl
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Protein synthesis by chick (Gallus domesticus) extraembryonic membranes

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1993
1. The protein synthesis in chorioallantoic membrane (CAM), amniotic membrane (AM) and yolk sac (YS) were studied by in vitro culture with 14C L-glutamic and immunoautoradiography. 2. The yolk sac synthesizes transferrin, alpha-fetoprotein (AFP) and serum albumin. These three proteins are also synthesized, but only in slight amounts, by AM.
L, Sánchez Palazón, A, Rodríguez-Burgos   +1 more
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Structure and function of the extraembryonic membrane persisting around the larvae of the parasitoid Toxoneuron nigriceps

Journal of Insect Physiology, 2006
The embryo of Toxoneuron nigriceps (Hymenoptera, Braconidae) is surrounded by an extraembryonic membrane, which, at hatching, releases teratocytes and gives rise to a cell layer embedding the body of the 1st instar larva. This cell layer was studied at different developmental times, from soon after hatching up to the first larval moult, in order to ...
Annalisa Grimaldi, Silvia Caccia, Terenzio Congiu, Roberto Ferrarese, Gianluca Tettamanti, Maria Luisa Rivas-Pena, Gianpaolo Perletti, Roberto Valvassori, B. Giordana, Patrizia Falabella, Francesco Pennacchio, Magda de Eguileor   +11 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 ...
Frels, W I, Chapman, V M
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Ontogeny of the extraembryonic membranes of the oviparous lizard,Eumeces fasciatus (Squamata: Scincidae)

Journal of Morphology, 2000
Oviposited eggs of Eumeces fasciatus contain embryos in the limb bud stage. Amniogenesis is complete and two yolk sac membranes, vascular trilaminar omphalopleure (choriovitelline membrane) and bilaminar omphalopleure, enclose the yolk vesicle. A small allantoic vesicle contacts the chorion.
Stewart, James R., Florian, James D.
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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, H E, Evans, W, Binns
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Morphogenesis of extraembryonic membranes and placentation in Mabuya 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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Extraembryonic Membranes of the Endoparasitic Wasp Cotesia congregata: Presence of a Separate Amnion and Serosa

The Journal of Parasitology, 1994
Little information is available describing the development of endoparasitic Hymenoptera prior to hatching of the first instar larva. The present study reveals that in Cotesia congregata, and likely other braconid wasp parasites, the serosa and amnion comprise separate layers encasing the developing first instar larva. Examination of newly hatched first
Nancy E. Beckage, Isaure de Buron
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Formation of the Placenta and Extraembryonic Membranes

Annals of the New York Academy of Sciences, 1998
ABSTRACT: In eutherian mammals, the first cell types that are specified during embryogenesis are committed to form extraembryonic (placenta and fetal membranes) rather than embryonic structures. The trophoblast cell lineage, for example, forms at the morula‐to‐blastocyst transition: cells at the periphery of the morula become trophoblast, whereas ...
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