What are the slender extensions that grow out from the trophoblast?

The slender extensions that grow out from the trophoblast are called trophoblastic villi. These structures are crucial during early pregnancy as they facilitate the implantation of the embryo into the uterine wall and help in nutrient exchange between the mother and the developing fetus. Trophoblastic villi also contribute to the formation of the placenta, supporting fetal growth throughout gestation.