View of the interior of the human gravid uterus at the 25th day. u, uterine wall; o, ovum with villous chorion; dv, decidua vera; dr, decidua reflexa, divided around the margin of the ovum, and turned down so as to expose its pitted surface, which has been removed from the ovum. The right ovary is divided, and shows in section the plicated condition of the early corpus luteum. Jones Quain (November, 1796 - January 31, 1865) was an Irish anatomist, professor of Anatomy and Physiology in the University of London, and author of Elements of Anatomy. This image has been colorized.