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- W78821185 abstract "This chapter discusses the development of mammals. In this group, development resembles that of reptiles and birds. The egg is telolecithal and the yolk comes to be invested in a yolk-sac, just as in the chick; the formation of amnion, chorion, and allantois also follows a similar path. The eggs have no true vitelline membrane and on discharge from the Graafian follicles of the ovary are surrounded by the cells of the cumulus oophorus and have a thick zona pellucida. The egg membrane elevates and becomes a kind of fertilization membrane. After fusion of the gamete nuclei, cleavage divisions commence. The egg as it divides has been rolling down the Fallopian tube and usually falls into the uterine lumen after a cavity has appeared among the completed cells. It is now known as a blastocyst. Almost all of the cells forming the wall of the blastocyst compose the trophoblast. There are two populations of cells on the outside of the blastocyst, the mural trophoblast whose cells form relationships with the mother, and the apical trophoblast lying above the inner cell mass, whose cells divide and add to the area of the trophoblast during development. Such slow cleavage and the lack of egg organization seem to be common to all mammals before the blastocyst stage. Differences in subsequent development relate, mostly, to different degrees of heterochrony of the embryonic membranes." @default.
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- W78821185 date "1982-01-01" @default.
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- W78821185 title "THE DEVELOPMENT OF MAMMALS" @default.
- W78821185 doi "https://doi.org/10.1016/b978-0-08-025926-0.50030-7" @default.
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