placental barrier

barrier

[bar´e-er] 1. an obstruction.2. a partition between two fluid compartments in the body.3. a covering used to prevent contact with body fluids.alveolar-capillary barrier (alveolocapillary barrier) see under membrane.blood-air barrier alveolocapillary membrane.blood-aqueous barrier the physiologic mechanism that prevents exchange of materials between the chambers of the eye and the blood.blood-brain barrier see blood-brain barrier.blood-gas barrier alveolocapillary membrane.blood-testis barrier a barrier separating the blood from the seminiferous tubules, consisting of special junctional complexes between adjacent Sertoli cells near the base of the seminiferous epithelium.barrier methods contraceptive methods such as condoms and diaphragms in which a plastic or rubber barrier blocks passage of spermatozoa through the vagina or cervix. See discussion under contraception.placental barrier the tissue layers of the placenta which regulate the exchange of substances between the fetal and maternal circulation.

pla·cen·tal mem·brane

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

pla·cen·tal mem·brane

(plă-sen'tăl mem'brān) The semipermeable layer of fetal tissue separating the maternal from the fetal blood in the placenta; composed of: 1) endothelium of the fetal tissues in the chorionic villi, 2) stromata of the villi, 3) cytotrophoblast (negligible after the fifth month of gestation), and 4) syncytiotrophoblast covering the villi; the placental membrane acts as a selective membrane regulating passage of substances from the maternal to the fetal blood.
Synonym(s): placental barrier.

单词	placental barrier
释义	DictionarySeeplacenta placental barrier 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. placental barrier barrier [bar´e-er] 1. an obstruction.2. a partition between two fluid compartments in the body.3. a covering used to prevent contact with body fluids.alveolar-capillary barrier (alveolocapillary barrier) see under membrane.blood-air barrier alveolocapillary membrane.blood-aqueous barrier the physiologic mechanism that prevents exchange of materials between the chambers of the eye and the blood.blood-brain barrier see blood-brain barrier.blood-gas barrier alveolocapillary membrane.blood-testis barrier a barrier separating the blood from the seminiferous tubules, consisting of special junctional complexes between adjacent Sertoli cells near the base of the seminiferous epithelium.barrier methods contraceptive methods such as condoms and diaphragms in which a plastic or rubber barrier blocks passage of spermatozoa through the vagina or cervix. See discussion under contraception.placental barrier the tissue layers of the placenta which regulate the exchange of substances between the fetal and maternal circulation. pla·cen·tal mem·brane the semipermeable layer of fetal tissue separating the maternal from the fetal blood in the placenta; composed of: 1) endothelium of the fetal vessels in the chorionic villi, 2) stromata of the villi, 3) cytotrophoblast (negligible after the fifth month of gestation), and 4) syncytiotrophoblast covering the villi; the placental membrane acts as a selective membrane regulating passage of substances from the maternal to the fetal blood. Synonym(s): placental barrier pla·cen·tal mem·brane (plă-sen'tăl mem'brān) The semipermeable layer of fetal tissue separating the maternal from the fetal blood in the placenta; composed of: 1) endothelium of the fetal tissues in the chorionic villi, 2) stromata of the villi, 3) cytotrophoblast (negligible after the fifth month of gestation), and 4) syncytiotrophoblast covering the villi; the placental membrane acts as a selective membrane regulating passage of substances from the maternal to the fetal blood. Synonym(s): placental barrier. FinancialSeeBarrier
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