Heart and lungs, historical illustration. Animated 19th Century hand coloured lithographic print of the human chest with the lungs (left and right) pulled back to reveal the heart, enveloped in the pericardium (white, centre). The carotid arteries (red) and jugular veins (blue) can be seen either side of the larynx (voicebox, top centre) and trachea (wind pipe) in the neck. Image from 'Traite complet de l'anatomie de l'homme, comprenant la medecine operatoire' Vol. 4 (1836), by Jean-Baptiste Marc Bourgery and illustrated by Nicolas-Henri Jacob.