Anchoring villi (human placenta, early midpregnancy)

Stain: Hematoxylin -azophloxine. The maternal side at the bottom shows reddish matrix-type fibrinoid accumulations (1) (Rohr's fibrinoid layer) close to an anchoring villus (2) and a cytotrophoblastic cell column (3). The anchoring villus is lined by cytotrophoblasts (4) which are covered at the outer side by multinuclear syncytiotrophoblasts (5). Intervillous space is marked by (6). (See also POJA-L1227). (7) phagocytic Hofbauer cell, (8) decidua cells; (9) points to the trophoblasts of the cytotrophoblast shell that expands laterally and covers the areas between the anchoring villi (3).