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23 Cards in this Set
- Front
- Back
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what kind of cells differentiate to angioblasts? |
mesoderm |
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mesoderm differentitates to form ___ converting villi to ___ |
blood vessels, tertiary villi |
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by the end of the 3rd week there is circulation between what? |
chorionic villi and the embryo |
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what is the first functional system in the embryo? |
cardiovascular |
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folding resuls from the rapid growth of the __ and __ but not the __ |
neural tube and amniotic cavity,
not the yolk sac |
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folding in the longitudinal plane results in what? |
the head and tail ends of the embryo swinging ventrally |
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what becomes the face and chest wall? |
somatopleure |
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part of what is incorporated as the foregut in ventral folding? |
yolk sac |
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what are neural tube defects? |
anencephaly, spina bifida |
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what should women take to prevent neural cord defects? |
folic acid |
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in folding in the transverse plane what does part of the yolk sac become? |
midgut |
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what forms the wall of the gut, and the wall of the body? |
splanchnopleure, somatopleure |
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does the head or tail fold occur first? and during which is part of the yolk sac incorporated as the hindgut? |
tail, and the tail |
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certain embryonic tissues act as inductors and influence the development of adjacent tissues and some signal passes from the inducing tissue to the induced tissue, may be due to? (3) and hwat are two examples |
1. a diffuseible molecule 2. the extracellular matrix 3. physical contact
1. notochord and neural tube 2. lens formation |
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what kind of organ is the placenta? |
fetomaternal |
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what is the maternal and fetal part of the placenta? |
maternal: decidua basalis of endometrium fetal: villus chorion |
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do fetal and maternal blood mix? |
no, flow close together |
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explain the flow of blood from the fetus to the placenta |
via 2 umbilical arteries - capillaries of the chorionic villi - exchange occurs - veins- umbilical vein - fetus |
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explain maternal blood to the placenta |
via 80-100 endometrial arteries- thru intervillous spaces - endometrial veins |
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what are the 4 functions of the placenta |
excretion, nutrition, endocrine secretion, gas exchange |
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what is the decidua |
gravid endometrium, the functional layer of the endometrium in a pregnant women that separates from the remainder of the uterus after parturition (childbirth) |
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what are the 3 regions of the decidua and what are they |
1. decidua basalis- forms the maternal part of the placenta 2. decidua capsularis - superficial part that overlies the conceptus 3. decidua parietalis- all remaining parts |
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twins that originate from 2 zygotes are called?
Twins from one zygote? |
dizygotic twins (fraternal twins) monozygotic (identical) |
