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| GrayAnatomy |
9 |
Toward the end of the second week transverse segmentation of the paraxial mesoderm begins, and it is |
2 |
19 |
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| GrayAnatomy |
11 |
The yolk-sac (Figs. 22 and 23) is situated on the ventral aspect of the embryo; it is lined by entod |
2 |
36 |
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| GrayAnatomy |
10 |
The embryo increases rapidly in size, but the circumference of the embryonic disk, or line of meetin |
2 |
39 |
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| GrayAnatomy |
5 |
Fertilization consists in the union of the spermatozoön with the mature ovum (Fig. 8). Nothing is kn |
2 |
43 |
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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 |
2 |
33 |
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| GrayAnatomy |
7 |
In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, ma |
2 |
71 |
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| GrayAnatomy |
15 |
—It is during this month that the first movements of the fetus are usually observed. The eruption of |
2 |
38 |
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| GrayAnatomy |
14 |
In the human embryo described by Peters the mesoderm outside the embryonic disk is split into two la |
2 |
104 |
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| GrayAnatomy |
13 |
The mandibular arch lies between the first branchial groove and the stomodeum; from it are developed |
2 |
333 |
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| GrayAnatomy |
3 |
The ova are developed from the primitive germ cells which are imbedded in the substance of the ovari |
2 |
146 |
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