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Yolk in Biological Dictionary

Yolk plug

... yolk plug is the remaining patch of endodermal cells ... eventually be internalized by epiboly. Frog yolk plug . This embryo is near the end of ... ... overlying the archenteron roof at the yolk plug gastrula stage ... Continue. Frog ...

Yolk

... An egg yolk is a part of an egg which serves as the food source for the developing embryo. The egg yolk is suspended in the egg white by one or two ... called the chalazae. Prior to fertilization, the yolk ... Come in and experience our newest concept, ...

Shell membrane

... eggs can ... the egg, it may be found that the yolk is stuck to the inner shell membrane . ... ... in the Shukhov Rotunda, Russia, 1895 ... The yolk is kept intact by the vitelline membrane surrounding it. ... Around the albumen and yolk are two shell membranes and the shell ...

Embryo sac

... in flowering plants) produces the ... The yolk sac is a membranous sac attached to an embryo , providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and ... equine embryos. ... the blastocele cavity, or yolk sac , is seen to be developed within the ...

Oocytes

... development. ... Oocytes are rich in cytoplasm which contains yolk granules to nourish the cell ... oocyte ( ) n. A cell from which ... a female gametocyte. ... Oocytes are rich in cytoplasm which contains yolk granules to ... Collagenase is used to remove the follicle cells ...

Germinal disc

... Disc is a small, circular, white spot on the surface of the yellow yolk of an egg that has been laid. The nucleus of the egg is in the ... white spot (approximately 2-3 mm across) on the surface of the yellow yolk of an egg that has germinal disk n. A flattened, disklike region ...

Chalazae

... Chalazae (kuh-LAY-zee) - Ropey strands of egg white which anchor the yolk in ... These strands are the chalazae which anchor the yolk in the center of the thick white. ... The more prominent the chalazae , ...

Blastoderm

... at one pole of macrolecithal eggs such as the yolky egg of birds. The yolk prevents the division from taking place through the egg, resulting in ... ( ) n. The layer of cells that develops on the surface of the yolk in an avian or reptilian egg and gives rise to the germinal disk from ...

Blastocoel

... cells with a small blastocoel . b. ... a disc of cells on top of the yolk that includes a thin blastocoel . d. ... Gastrulation It has been ... ... The hypoblast spreads out and covers the blastocoel to form the yolk sac. ... In organisms that reproduce sexually, once a sperm ...

Primary oocyte

... with free online dictionary, ... Search another word or see primary oocyte on Thesaurus | Reference ... The primary oocyte produces yolk granules and the follicular cells change from ... is secreted by the primary oocyte . Estrogen is secreted by granulosa ... ... oogenesis, ...

Oogonia

... Oogonia are also the female reproductive ... During week 6 of development, oogonia migrate from the yolk sac to the genital ... Oogonia develop by mitosis. ... Once they have reached the gonadal ridge they are called oogonia . Development ...

Notochord

... and more. ... The notochord is a cylindrical column of cells ... As the notochord closes as a tube, it detaches from the endoderm of the yolk sac ... Fate of notochord : It will eventually break up into section of weight-bearing ... Notochord ... The notochord is a midline column ...
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