placental barrier


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placental barrier

[plə′sent·əl ′bar·ē·ər]
(embryology)
The tissues intervening between the maternal and the fetal blood of the placenta, which prevent or hinder certain substances or organisms from passing from mother to fetus.
References in periodicals archive ?
13) However, it is not only the mother who experiences withdrawal from medication, as most drugs that enter the maternal system cross the placental barrier or are secreted in breast milk.
Vitamin K is transmitted poorly across the placental barrier, and at birth, vitamin K levels are often below the detection limit of 0.
1970), sodium cyclamate crosses the placental barrier approaching a fetal concentration of this substance equivalent to one quarter of the existent maternal concentration.
Sellman says, "The placental barrier does not protect the fetus from hormone mimics.
While the placental barrier can stop many toxic elements, MeHg crosses the placenta and accumulates at higher concentrations on the fetal side than on the maternal.
So the question becomes, can we protect fetuses from chemicals that might cross the placental barrier.
These pollutants also can interfere with the function of the brain and endocrine system by penetrating the placental barrier and scrambling the instructions of the naturally produced chemical messengers.
Ritonavir (Norvir) has also shown birth defects in rats and rabbits but doesn't seem to cross the placental barrier in humans.
Before birth, babies make few antibodies; the mother's antibodies pass through the placental barrier and protect the child from disease before birth and for some time afterward.
Women who want to get pregnant and are trying to do so should remember that everything that goes into the mouth crosses the placental barrier.
A case study conducted in Brazil revealed the presence of Zika virus in the amniotic fluid of two pregnant women, suggesting that the virus can cross the placental barrier and potentially infect the developing fetus.
Therefore, it will be increasingly important to investigate NP transport across internal barriers such as the placental barrier between the mother and the unborn child.