SHEEP HEART DISSECTION – Adapted from Homelearning.comObservation: External Anatomy Most heart diagrams show the leftatrium and ventricle on the rightside of the diagram. Imagine theheart in the body of a person facing you. The left side of their heart is on theirleft, but since you arefacing them, it is on yourright.1. Identify the right and left sides of the heart. Look closely and on one side you will see a diagonalline of blood vessels that divide the heart. The half that includes all of the apex(pointed end) of theheart is the left side. Confirm this by squeezing each half of the heart. The left half will feel muchfirmer and more muscular than the right side. (The left side of the heart is stronger because it has topump blood to the whole body. The right side only pumps blood to the lungs.)2. Turn the heart so that the right side is on your right, as if it were in your body. Examine the flaps ofdarker tissue on the top of the heart. These ear-like flaps are called auricles. Find the large openingat the top of the heart next to the right auricle. This is theopening to the superior vena cava,which brings blood fromthe top half of the body to the right atrium(the atriaare thetop chambers in the heart). Stick a probe down this vessel.