Medical Definition of Placental barrier

1. The semipermeable layer of foetal tissue separating the maternal from the foetal blood in the placenta; composed of: 1) endothelium of the foetal vessels in the chorionic villi, 2) stromata of the villi, 3) cytotrophoblast (negligible after the fifth month of gestation), and 4) syncytial trophoblast covering the villi; the placental membrane acts as a selective membrane regulating passage of substances from the maternal to the foetal blood. Synonym: placental barrier. (05 Mar 2000)



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Lexicographical Neighbors of Placental Barrier

placenta previa centralis
placenta previa marginalis
placenta previa partialis
placenta protein
placenta reflexa
placenta reniformis
placenta spuria
placenta triloba
placenta tripartita
placenta triplex
placenta uterina
placenta velamentosa
placentae
placental
placental abruption
placental barrier (current term)
placental calcium-binding protein
placental chorioangioma
placental circulation
placental dysfunction
placental dysfunction syndrome
placental dysmature
placental dystocia
placental extracts
placental function tests
placental growth hormone
placental hormones
placental insufficiency
placental lactogen
placental lobes

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