Multilayered membrane of fetal tissue within the placenta that separates the maternal blood from the fetal blood and allows selective passage of substances between the two.
Note: This membrane blocks only a few xenobiotics.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 793 (https://doi.org/10.1515/pac-2015-1202)