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
History of anatomy their valves, and tracing the course of the blood from the right to the left side of the heart. The rise in anatomy lead to various discoveries and findings. In 1628, English physician William Harvey observed circulating blood through dissections of his father’s and sister’s bodies. He published "De moto cordis et sanguinis", a treatise in which he explained his theory. In addition, during the 17th century, Galileo Galilei introduced the experimental method to scientific research. This led to innovation and change in anatomy. In Tuscany and Florence, Marcello Malpighi founded microscopic anatomy, and Nils Steensen studied the anatomy of