Presentation on theme: "Decidua, chorion, placenta, umbilical cord. Doc. MUDr. Marie Jirkovská, CSc. Institute of Histology and Embryology."— Presentation transcript:
Decidua, chorion, placenta, umbilical cord. Doc. MUDr. Marie Jirkovská, CSc. Institute of Histology and Embryology
Decidua endometrium in pregnancy- decidua basalis - pars materna placentae (endometrium) schema secretory phase decidual cells
Chorion B.M.Carlson: Human Embryology and Developmental Biology, 1999 Decidua basalis
Chorionic villi primary (P) secondary (S) tertiary (T) P P S syncytiotrophoblast cytotrophoblast capillary Hofbauer‘s cells
Chorion S - syncytiotrophoblast, C - cytotrophoblast, M - mesenchyme, H - Hofbauer cells H M CSCS
Chorionic villi * proliferation and migration of cytotrophoblast, C – cytotrophoblast shell, V – chorionic villus, D - decidua * * V V C C D
Relationship of decidua and chorion
Human placenta at term Discoid (diameter 15 – 20 cm, thickness 2 – 3 cm) – according shape Hemochorial villous – according structure Placenta consists of: fetal part (villous chorion) and maternal part (decidua basalis) cotyledons
Human placenta at term – a scheme Fetal part: chorionic plate and cotyledons consisting of one or more main stem villi and their branches. Maternal part: decidual plate is covered by syncytiotrophoblast, contains decidual cells and remnants of the cytotrophoblastic shell.
Placenta at low magnification
Stem and intermediate villi Fibrinoid – eosinophilic mass on the surface of villi, decidua basalis and chorionic plate (material composed of fibrin from maternal blood and degenerated cells).