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Eggs with relatively little, uniformly distributed yolk are termed isolecithal. This condition occurs in invertebrates and in all but the lowest mammals. Eggs with abundant yolk concentrated in one hemisphere of the egg are termed telolecithal. ... Yolk in monotremes...
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dictionary.reference.com/browse/yolk
dictionary.reference.com/browse/yolk
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Yolk plug - Definition of Yolk plug at Dictionary.com a free online dictionary with pronunciation, synonyms, and translation of Yolk plug. Look it up now! ... ; Main Entry: yolk plug; Function: noun; : a mass of yolk cells found in the blastopore of the embryos of some vertebrates...
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dictionary.reference.com/browse/yolk+plug
dictionary.reference.com/browse/yolk+plug
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The eggs layed by monotremes are small (13-15 mm diameter) and covered by a leathery shell. The number of eggs laid is small, usually 1-3, and they are placed in the mother's pouch. They contain a large yolk, which is concentrated at one end of the egg very much like the yolk of a bird's egg.
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animaldiversity.ummz.umich.edu/site/accounts/informatio...
animaldiversity.ummz.umich.edu/site/accounts/information/Monotremata.html
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By comparison with the function of the vesicle components in marsupials, it is suggested that one role for the white yolk in monotremes and the sauropsids is to provide extracellular matrix (ECM), especially hyaluronan containing stabilizing proteins, for epithelial construction.
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cat.inist.fr/?aModele=afficheN&cpsidt=21811713
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The white yolk was retained in monotremes and marsupials where blastocyst epithelial ...... The white yolk of monotremes is formed of clear ...
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doi.wiley.com/10.1002/jez.b.21235
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*The marsupial and monotreme zygote is polarised with respect to position of nuclear material at the Animal (future embryonic pole) and either yolk droplets ...
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doi.wiley.com/10.1002/bies.20360
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allantois for mobilization of yolk and respiratory exchange. However, they all have ... Fig. 4.1 Placental membranes in monotremes and marsupials ...
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www.springerlink.com/index/k03071g2065w61u6.pdf
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Basal synapsids were probably generous suppliers of egg yolk. Monotremes are relatively mean. The eggs are small and the hatchlings bash their way out at an early developmental stage. (It's about nine to eleven days for short-beaked echidna puggles.) They then spend months enjoying a diet of maternal milk.
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home.arcor.de/ktdykes/mammsandeggs.htm
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Microlecithal eggs are eggs with a small amount of yolk. Mammals (other than monotremes) have microlecithal eggs. Mesolecithal eggs have a moderate amount of yolk and are typical of amphibian eggs. Macrolecithal eggs contain a large amount of yolk.
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academic.emporia.edu/sievertl/verstruc/vsdweb1.htm
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