Читать книгу Blackwell's Five-Minute Veterinary Consult: Reptile and Amphibian - Javier G. Nevarez - Страница 23

The heart of crocodilians has four chambers (two atria and two ventricles) while that of all other reptile species has three chambers (two atria and one ventricle). The ventricle of non‐crocodilian reptile hearts is divided into three chambers separated by incomplete muscular ridges. The cavum venosum receives blood from the right atrium dorsally and the paired aortas ventrally. The cavum arteriosum receives blood from the left atrium. The cavum pulmonale opens into the pulmonary artery and is equivalent to right ventricle in mammals. The admixture of oxygenated and deoxygenated blood varies across species and is influenced by the presence of a muscular ridge separating the three areas of the ventricle. The right and left cranial vena cava and the left hepatic vein supply blood to the sinus venosus. Reptiles have two aortas, with the left aorta giving rise to the celiac, cranial mesenteric, and left gastric arteries before joining the right aorta caudal to the heart. The blood flow through a non‐crocodilian heart is outlined in Figure 1 (see web image supplementary content for section I).