Trophoblast invasion is an essential component of haemochorial placentation and has to be
considered in relation to reactive changes in the maternal uterine tissues. Some
comparative aspects of human and laboratory rodents are discussed and, although there is
an obvious phylogenetic gap between the two, many characteristics of placental
development are found to be analogous. Trophoblast growth into the uterus is different in
different species: localized trophoblast growth forming a bulky tissue (mouse, rat, hamster) …