review for lab prac 1 fall 2004 embriology

review for lab prac 1 fall 2004 embriology - Concurrent...

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Embriology
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At this stage of development, cells of the morula secrete a fluid, forming a bladder- like space, called the blastocyst cavity. The morula transforms into a blastocyst The blastocyst cells form two cell masses an inner cell mass, called the embryoblast , precursor of an embryo an outer cell mass, called the trophoblast , precursor of extraembryonic membranes
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Unformatted text preview: Concurrent with differentiation of two cellular masses of the blastocyst, the zona pellucida breaks apart, releasing the blastocyst from it and allowing the blastocyst to prepare to implant into the endometrial wall of the uterus. The outer cell mass, or trophoblast, initially contacts the endometrial wall....
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