placental barrier n.
The semipermeable layer of tissue in the placenta that serves as a selective membrane to substances passing from maternal to fetal blood.
- Placental circulation
placental circulation n. Circulation of blood through the placenta during intrauterine life, serving fetal needs for aeration, absorption, and excretion.
- Placental dystocia
placental dystocia n. The retention or difficult passage of the placenta following delivery.
- Placental growth hormone
placental growth hormone n. See human placental lactogen.
- Placental lobe
placental lobe n. The unit of the human placenta, incompletely separated by septa, that contains the fetal cotyledon or cotyledons and the surrounding blood-filled intervillous space.