Development Of Placenta Ppt

, meaning it is composed of both fetal tissue (derived from the chorionic sac) and maternal tissue (derived from the uterine endometrium). Stages of Placental Development Placentation begins almost immediately after fertilization and evolves through distinct phases: Implantation (Week 1–2): The blastocyst attaches to the uterine lining. Trophoblast cells proliferate and invade the endometrium, breaking down maternal capillaries to form early blood-filled cavities called lacunae. Villi Formation (Week 3): Primary Villi: Simple columns of trophoblast cells. Secondary Villi: A core of mesenchymal tissue grows into the primary villi. Tertiary Villi: Embryonic blood vessels develop within the villi, establishing a functional connection to the fetal heart by the end of the third week. Trophoblastic to Placental Transition (Week 4–12): Initially, the embryo receives nutrition by digesting endometrial tissue (histiotrophic phase). Between weeks 4 and 12, the placenta gradually matures into its final form, taking over full responsibility for nourishment (hemotrophic phase). Maturation (Mid-gestation to Term): The placenta grows in size until approximately week 36, after which it focuses on functional efficiency to support rapid fetal growth without increasing in mass. Anatomy and Structure At term, the human placenta is a discoid, spongy organ approximately 20 cm in diameter and 3 cm thick. It consists of three primary layers: 11 sites Placenta and Placental Derivatives in Regenerative Therapies: ... Jan 18, 2018 —

Villi are the functional units of the placenta. development of placenta ppt

| Abnormality | Description | |--------------|-------------| | Placenta previa | Placenta covers internal os → bleeding | | Placenta accreta | Abnormal attachment to myometrium | | Succenturiate lobe | Accessory lobe connected by vessels | | Battledore placenta | Cord attached at margin | | Velamentous cord | Vessels run through membranes | , meaning it is composed of both fetal

: Form as solid cords of cytotrophoblast cells. Villi Formation (Week 3): Primary Villi: Simple columns

(villous part at decidua basalis) → forms fetal placenta