Heart and Lungs

The heart, showing its relative position to the lungs. The heart is almost wholly covered up by the lungs and it is encased in a sack or bag (the pericardium), and around this there is considerable padding. The lungs are represented as drawn apart, so that a full view of the heart with its arteries and veins can be seen, and the sac of the heart and packing material is also removed. At a is the trachea or windpipe; on each side are the two arteries that go to the head; c is the artery that goes to the arm; b, b are the veins coming from the head, and d, d the veins from the arms, all emptying into a large vein that goes to the right auricle of the heart, e; f is the large vein that brings the blood from below to this auricle; g is the right ventricle, i the left, and h is the aorta as it goes down from the heart.

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