Comparative Test 4 (PC 1)
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What are the four different catagories of placental classifications
- Based on closeness of contact between chorioallantoic membrane and uterus.
- Based on distribution of villi.
- Based on means of discharge.
What are the four different catagories of placental classifications based on closeness of contact between chorioallantoic membrane and uterus.
Describe epitheliochorial .
Maternal and fetal parts of placenta interdigitate but all cell layers remain intact.
Chorionic vili fit in depressions in the uterine wall, uterine connective tissues break down but no tissue is lost a birth.
Embryonic and maternal tissues inseparably grow together.
Extensive breakdown of maternal tissue, chorionic villi like in pools of maternal blood.
What are the catagories of placentas based on distribution of villi?
Describe diffuse distribution of villi.
Villi spread over entire surface of chorioallantoic membrane.
Describe cotyledonary distribution of villi.
grouped in seperate bunches (cotyledons)
Describe zonary distribution of villi.
ring shaped distribution of villi around membrane.
Describe discoid distribution of villi.
villi forms a round plate on one surface of the chorioallantoic membrane.
What are the catagories of placental classifications based on means of discharge?
Describe nondeciduate discharge.
no maternal tissue is lost.
Describe deciduate discharge.
uterine (maternal) part of placenta is shed along with a great deal of blood.
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