Peculiarities of the bones, muscles, and nervous system of the conjoined twins.

The peculiarities of the skeletal, muscular, and nervous systems of conjoined female twins (2 spines, one pelvis) is described judging from the examination of the 2 skulls, 2 vertebral columns, shoulder girdle of the intermediate connection between the trunks, deep muscles of the back, 2 separate central nervous systems, lack of changes in the muscles, of the anterior aspect of the thorax and anterolateral muscles of the abdomen; from what we have observed it is suggested that this is a case of uniovary twins whose separation began in the superior dorsal side but was incomplete in the ventral inferior parts. It is possible that this arose from accidents of fusion or fission of embryos.