In this video, The placental circulation is explained. Also, Placental barrier villi changes and intervillous space changes are briefed. TIMELINE: 0:29 Types of placental circulation 0:39 Uteroplacental circulation 0:58 Arterial circulation 1:09 Spiral artery remodelling 1:40 Extravillous trophoblast and types 1:50 Circulation in intervillous space 2:09 Intervillous hemodynamics 2:29 Fetoplacental circulation 3:12 Fetal hemodynamics 3:21 Placental barrier 3:43 Placental barrier at term 4:02 Placental ageing 4:14 Villi changes 4:34 Decidual changes 4:43 Intervillous space changes