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# proj.
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# Ann.
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| GrayAnatomy |
12 |
In reptiles, birds, and many mammals the allantois becomes expanded into a vesicle which projects into the extra-embryonic celom. If its further development be traced in the bird, it is seen to projec |
21.3 KB |
2019-12-21 |
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2 |
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724 |
2024-12-25
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| GrayAnatomy |
13 |
The mandibular arch lies between the first branchial groove and the stomodeum; from it are developed the lower lip, the mandible, the muscles of mastication, and the anterior part of the tongue. Its c |
12.7 KB |
2019-12-21 |
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2 |
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533 |
2024-12-25
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| GrayAnatomy |
02 |
THE TERM Embryology, in its widest sense, is applied to the various changes which take place during the growth of an animal from the egg to the adult condition: it is, however, usually restricted to t |
10.7 KB |
2019-12-21 |
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2 |
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436 |
2024-12-25
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| GrayAnatomy |
06 |
The early segmentation of the human ovum has not yet been observed, but judging from what is known to occur in other mammals it may be regarded as certain that the process starts immediately after the |
9.42 KB |
2019-12-21 |
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2 |
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336 |
2024-12-25
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| GrayAnatomy |
03 |
The ova are developed from the primitive germ cells which are imbedded in the substance of the ovaries. Each primitive germ cell gives rise, by repeated divisions, to a number of smaller cells termed |
7.71 KB |
2019-12-21 |
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2 |
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320 |
2024-12-25
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| GrayAnatomy |
04 |
The spermatozoa or male germ cells are developed in the testes and are present in enormous numbers in the seminal fluid. Each consists of a small but greatly modified cell. The human spermatozoön poss |
4.67 KB |
2019-12-21 |
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2 |
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195 |
2024-12-25
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| GrayAnatomy |
14 |
In the human embryo described by Peters the mesoderm outside the embryonic disk is split into two layers enclosing an extra-embryonic cœlom; there is no trace of an intra-embryonic cœlom. At a later s |
3.9 KB |
2019-12-21 |
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2 |
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137 |
2024-12-25
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| GrayAnatomy |
05 |
Fertilization consists in the union of the spermatozoön with the mature ovum (Fig. 8). Nothing is known regarding the fertilization of the human ovum, but the various stages of the process have been s |
2.71 KB |
2019-12-21 |
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2 |
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130 |
2024-12-25
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| GrayAnatomy |
07 |
In front of the primitive streak two longitudinal ridges, caused by a folding up of the ectoderm, make their appearance, one on either side of the middle line (Fig. 16). These are named the neural fol |
2.79 KB |
2019-12-21 |
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2 |
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128 |
2024-12-25
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| GrayAnatomy |
10 |
The embryo increases rapidly in size, but the circumference of the embryonic disk, or line of meeting of the embryonic and amniotic parts of the ectoderm, is of relatively slow growth and gradually co |
1.89 KB |
2019-12-21 |
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2 |
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87 |
2024-12-25
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