A fish's two-chambered heart in section, after Ahnode's scheme on Wikimedia Commons: ten structures in Latin – the ventral aorta, the bulbus arteriosus, the ventricle with its spongy myocardium and trabeculae, the atrium, the sinus venosus with its vein openings and afferent veins, and the…
A real anatomical diagram. Hover any part to see its name, click to answer the quiz question.