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| GrayAnatomy |
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In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, ma |
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| GrayAnatomy |
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The mandibular arch lies between the first branchial groove and the stomodeum; from it are developed |
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| GrayAnatomy |
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The yolk-sac (Figs. 22 and 23) is situated on the ventral aspect of the embryo; it is lined by entod |
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| GrayAnatomy |
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Fertilization consists in the union of the spermatozoön with the mature ovum (Fig. 8). Nothing is kn |
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| GrayAnatomy |
8 |
The notochord (Fig. 19) consists of a rod of cells situated on the ventral aspect of the neural tube |
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| GrayAnatomy |
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The ova are developed from the primitive germ cells which are imbedded in the substance of the ovari |
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| GrayAnatomy |
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The spermatozoa or male germ cells are developed in the testes and are present in enormous numbers i |
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| GrayAnatomy |
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The early segmentation of the human ovum has not yet been observed, but judging from what is known t |
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| GrayAnatomy |
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Toward the end of the second week transverse segmentation of the paraxial mesoderm begins, and it is |
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| GrayAnatomy |
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In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects in |
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