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17 Cards in this Set

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Amnion

a member that forms a fluid-filled sac around the embryo

Blastocyst

an early stage of embryo development, which can be recognized through the presence of an inner cell mass

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

embryo

developing human within the first 2 months after conception

endoderm

the innermost of the 3 primary germ layers of the embryo

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

inner cell mass (ICU)

the cells at the embryonic pole of the blastocyst, which are connected with formation of the body of the embryo

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.

microcephaly

abnormally small head



morula

earliest stage of of embryo after cell division, consisting of a ball of identical cells

organogenesis

formation of organs during development

paracrines

group of chemical messengers that communicate with neighboring cells by simple diffusion

parturition

giving birth

phocomelia

defective development of arms or legs or both so that the hands and feet are attached close to the body, resembling a seal

porencephaly

the occurrence of cavities in the brain substance, communicating usually with the lateral ventricles

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

zygote

fertilized ovum before cleavage begins