Chang and Eng Bunker used as early as October 1829 to describe other conjoined twins. Decades later use of the standalone "Siamese twins"—which modern researchers see as outmoded, preferring "conjoined twins"—became widespread. Thus Chang and Eng have often been retrospectively referred to as the "original Siamese twins". Before the Bunkers' bodies were returned to North Carolina for burial (in 1917 they were moved to the cemetery at White Plains Baptist Church outside Mount Airy), doctors took photographs of the connecting tissue and hired sculptor John Casani to make a plaster cast of the twins. The Bunkers' fused livers are preserved in fluid and displayed
Monochorionic twins Monochorionic twins Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth), these are monochorionic multiples. Monochorionic twins occur in 0.3% of all pregnancies. 75% of monozygotic twin pregnancies are monochorionic; the remaining 25% are "dichorionic diamniotic". If the placenta divides, this takes place after the third day after fertilization. Monochorionic twins generally have two amniotic sacs (called Monochorionic-Diamniotic "MoDi"), but sometimes, in the case of monoamniotic twins (Monochorionic-Monoamniotic "MoMo"), they also share the same amniotic sac. Monoamniotic twins occur when the split takes place after