This is a simplified version of the heart. It is one of he easiest ways to learn heart anatomy and blood flow through the heart. I have been told that it is used by medical schools to teach heart anatomy to medical students. Once you have learned the anatomy and flow on the model use it to find the structures on the heart models used in lab. You will find the square heart is almost completely anatomically correct. There are a few deviations: the pulmonary artery divides into left and right pulmonary arteries that go to each of the lungs; two pulmonary veins return blood to the heart (left atrium) from each lung on each side (4 pulmonary veins total). Blue arrows represent deoxygenated blood and red arrows represent oxygenated blood. Let’s get started.
The heart is divided into 4 chambers the superior 2 chambers are the atria (singular: atrium) and the inferior chambers are the ventricles. The ventricles are separated by the interventricular septum (inter “between”) and the atria are separated by the interatrial septum.
The superior vena cava drains all of the blood from the tissues superior to the heart and the inferior vena cava drains all of the blood from the tissues inferior to the heart. The blood will flow from these vessels into the right atrium.