'Blastocyst cavity' presentation slideshows

HUMAN REPRODUCTION BIOLOGY 269

HUMAN REPRODUCTION BIOLOGY 269. Assuming: You paired up with an appropriate partner You elicited normal sexual responses from each other A few milliliters of semen, containing 200- to 600-million sperm, were deposited high in the vagina, just below the cervix of the uterus. Scenario I:

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Stage 4 18hr

Finish chick early development: Node regression, notochord formation, and neurulation in the ectoderm Organization of the body axis, cross-section Development of 4 extra-embryonic tissues.

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Neurulation in the chick, after the node regresses

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