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17 Cards in this Set
- Front
- Back
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Amnion |
a member that forms a fluid-filled sac around the embryo |
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Blastocyst |
an early stage of embryo development, which can be recognized through the presence of an inner cell mass |
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Ectoderm |
the outer layer of cells in the embryo, after establishment of the 3 primary germ layers (ectoderm, mesoderm, endoderm); the germ layer that comes in contact with the amniotic cavity |
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embryo |
developing human within the first 2 months after conception |
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endoderm |
the innermost of the 3 primary germ layers of the embryo |
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hydrocephalus |
a condition marked by an excessive accumulation of cerebrospinal fluid, resulting in dilation of the cerebral ventricles and raised intracranial pressure; it may also results in enlargement of the cranium and atrophy of the brain |
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inner cell mass (ICU) |
the cells at the embryonic pole of the blastocyst, which are connected with formation of the body of the embryo |
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mesoderm |
middle of the 3 primary germ layers of the embryo, origin of the tissues, myoblasts, blood, the cardiovascular and lymphatic systems, urogenital, lining of the pericardial, pleural , and peritoneal cavities. |
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microcephaly |
abnormally small head |
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morula |
earliest stage of of embryo after cell division, consisting of a ball of identical cells |
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organogenesis |
formation of organs during development |
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paracrines |
group of chemical messengers that communicate with neighboring cells by simple diffusion |
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parturition |
giving birth |
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phocomelia |
defective development of arms or legs or both so that the hands and feet are attached close to the body, resembling a seal |
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porencephaly |
the occurrence of cavities in the brain substance, communicating usually with the lateral ventricles |
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trophoblasts |
cell layer covering the blastocyst that erodes the uterine mucosa and through which the embryo receives nourishments from the mother. contribute to placenta formation |
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zygote |
fertilized ovum before cleavage begins
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