DICHORIONIC TWINS (fraternal)

Happy BIRTHday to these two babes whom came #Earthbound double time on 8/31 😝🎂🎉🎈

Lets talk Anatomy. The placenta (Greek, plakuos = flat cake) The placenta is composed of three layers. The innermost placental layer surrounding the fetus is called the amnion. The allantois is the middle layer of the placenta (derived from the embryonic hindgut); blood vessels originating from the umbilicus traverse membrane.

The placenta functions as a fetomaternal organ with two components: the fetal placenta (Chorion frondosum), which develops from the same blastocyst that forms the fetus, and the maternal placenta (Decidua basalis), which develops from the maternal uterine tissue.

In the picture shown of the two placenta’s were the owners of twins. (💙Boy & girl💝) twins that develop in separate sacs surrounded by two separate chorions are considered dichorionic. The prefix "di" indicates two. All dizygotic, or fraternal, twins are dichorionic. Twins that are dichorionic are by definition also diamniotic, since each amniotic sac has its own outer membrane.