Zhongjianornis an enlarged, keeled breastbone in more advanced birds. However, later analysis of the anatomy of "Z. yangi" cast doubt on this interpretation of the bird as very primitive. Research published in 2012 found that some of the apparently primitive features were due to poor preservation of the bones, and that "Zhongjianornis" is more similar in anatomy to primitive euornitheans like "Chaoyangia" and "Schizooura". A phylogenetic analysis showed that a very primitive position in the bird family tree for "Z. yangi" is unlikely given current evidence. Zhongjianornis Zhongjianornis is a genus of beaked, pigeon-sized birds from the early Cretaceous period of
Sociopolitical issues of anatomy in America in the 19th century set up to teach people the natural and moral sciences of the human body, anatomy museums gradually declined in status with the progress of medical science and education. In postbellum America, the division between high and low medicine increased. The focus of public scientific education turned toward the structures and functions of plants, animals, and cells, and this was done through politically and socially approved public school curriculums and sanitary fairs. These other avenues not only appeared more legitimate, but also reduced the uniqueness of anatomy museums. Anatomy museums' popularity also suffered with the establishment of nonprofit art and natural