part of part of anatomical structure placenta placental disc 2024-01-16T17:50:20Z A disc-shaped structure that is part of the placenta. A placental disc supports fetal development through the exchange of nutrients between maternal and fetal bloodstreams. The placental disc is structured to keep the blood streams separate, while maximizing surface area for the transport of nutrients between them, to maintain an immunological barrier. placental disk UBERON:8600038