That anchoring structure is called the placenta.
Placental (ex. placental mammal) is an animal that nourishes it's developing young internally (inutero/in a uterus) where the connection between the mother's bloodstream and the baby's blood stream using a series of membranes called the placenta. These membranes are produced by the developing offspring and attach to the uterine wall to facilitate the transfer of oxygen and nutrients to the developing "infant" and allow the removal of waste products from the "infant" to the mother.
The largest group of mammals are called placentals. These mammals are animals that during pregnancy have a placenta that feeds the incubating offspring.
Placenta Previa
umbilical cord
the placenta is called an afterbirth after the baby is born
The membranous sheets that connect developing cranial bones are called fontanelles. These soft spots on a baby's head allow for flexibility during birth and rapid brain growth in the first few years of life.
This cluster of cells change the baby grows from pre-embryo to embryo to fetus.
It comes from a temporary organ called the placenta. The fetus is connected to the placenta by the umbilical cord. From the placenta, which is normally attached to the uterine wall, blood, oxygen, and nutrients are transferred through the umbilical cord to the developing fetus.
placenta
Placenta previaThat is called "placenta previa".placenta previaPlacenta previaplacenta previa
A canine offspring is called a puppy.