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serves as a location of haematopoiesis. Before the placenta is formed and can take over, the yolk sac provides nutrition and gas exchange between the mother...8 KB (972 words) - 21:55, 3 May 2024- the placenta. On the outer side, the amniotic sac is connected to the yolk sac, the allantois, and via the umbilical cord, the placenta. The yolk sac, amnion...10 KB (1,167 words) - 15:35, 7 June 2024
Among animals which produce eggs, the yolk (/ˈjoʊk/; also known as the vitellus) is the nutrient-bearing portion of the egg whose primary function is to...18 KB (2,240 words) - 14:58, 28 February 2024
Vitelline duct (redirect from Yolk-stalk)vitellointestinal duct, the yolk stalk, the omphaloenteric duct, or the omphalomesenteric duct, is a long narrow tube that joins the yolk sac to the midgut lumen...4 KB (431 words) - 00:17, 12 July 2024
shark, the yolk-sac placenta is globular or spherical.: 380–381 b At first, the embryos are sustained by a yolk sac, but later a placenta develops. c...35 KB (3,536 words) - 12:22, 9 July 2024
Placentation (redirect from Hemochorial placenta)paraplacentome supports the exchange of respiratory gasses, and the yolk sac placenta supports lipid transport via apocrine secretion. Placental functions...19 KB (2,122 words) - 16:47, 17 July 2024- well as the embryonic part of the placenta and its associated membranes: amnion, chorion (gestational sac), and yolk sac. "Conceptus". Retrieved 13 March...1 KB (106 words) - 17:41, 31 October 2023
- A choriovitelline placenta is a placenta formed by the yolk sac and chorion. In a choriovitelline placenta, the yolk sac fuses with the chorion and, subsequently...1 KB (130 words) - 20:34, 22 March 2024
Fetal membranes (section Yolk sac)chorion, allantois, and yolk sac. The amnion and the chorion are the chorioamniotic membranes that make up the amniotic sac which surrounds and protects...16 KB (1,893 words) - 02:46, 30 April 2024
become the amniotic sac that provides a protective environment for the developing embryo. The amnion, along with the chorion, the yolk sac and the allantois...9 KB (1,207 words) - 22:56, 27 June 2024
meaning that the mother directly transfers nutrients to her young via a yolk-sac placenta and the young are born alive. Fertilization is internal and occurs...25 KB (2,883 words) - 22:58, 16 July 2024
yolk sac. When the supply of yolk is exhausted, the depleted yolk sac transforms into a structure analogous to a mammalian placenta (called a "yolk sac...39 KB (3,720 words) - 18:05, 25 July 2024
will give rise to the pre-embryo, the amnion, yolk sac and allantois, while the fetal part of the placenta will form from the outer trophoblast layer. The...43 KB (5,259 words) - 04:42, 8 July 2024- Chorion (redirect from Chorionic sac)reptiles (amniotes). It develops from an outer fold on the surface of the yolk sac, which lies outside the zona pellucida (in mammals), known as the vitelline...11 KB (1,223 words) - 16:02, 18 January 2024
needed] Jaws Upper teeth Lower teeth They are viviparous, with a yolk-sac placenta, delivering 4 to 135 pups per litter. The gestation period is between...22 KB (2,339 words) - 19:21, 27 July 2024- handle liquid waste. The allantois, along with the amnion, chorion, and yolk sac (other extraembryonic membranes), identify humans and other mammals, birds...8 KB (873 words) - 05:43, 28 May 2024
- species, the internally developing embryos rely solely on yolk. This is known as "yolk-sac viviparity" and is regarded as a type of lecithotrophy (no...7 KB (791 words) - 21:22, 21 April 2024
smooth dogfish is from May to June. They are viviparous and have a yolk-sac placenta. Females can store sperm up to a year, but how long it can be used...12 KB (1,347 words) - 19:34, 15 July 2024
much of their time on the bottom. It is probably viviparous, with a yolk-sac placenta (speculation through analogy to related species of carcharhinids)...25 KB (3,017 words) - 13:46, 3 July 2024
begins after the birth of the baby, further contractions expel the placenta, amniotic sac, and the remaining portion of the umbilical cord usually within...25 KB (3,016 words) - 20:20, 26 July 2024
- placenta there is an intimate connexion between the walls of the yolk sac and the uterine mucous membrane, and so an umbilical or omphalic placenta exists
- childhood nless they have foci of yolk sac tumor. If the latter is the case, they should be treated as one would treat a yolk sac tumor. McDougal WS, Wein AJ
- Epiblast → embryo, amnion Hypoblast → yolk sac Trophoblast → syncytiotrophoblast + cytotrophoblast → placenta Epiblast → endoderm, mesoderm, ectoderm