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Pleura and peritoneum. The thoracic cavity is lined by the pleura and the abdominal cavity is lined by the peritoneum. Both have an inner (visceral) and an outer (parietal) layer. The parietal layer (at left) contains the blood vessels and nerves. The visceral layer (at right) secretes lubricating serous fluid that reduces friction from movement. At lower centre are the aorta (red), the body's main artery, and the vena cava (blue), the body's main vein. This anatomical artwork is plate 5 from volume 5 (1839) of 'Traite complet de l'anatomie de l'homme' (1831-1854). This 8-volume anatomy atlas was produced by the French physician and anatomist Jean-Baptiste Marc Bourgery (1797-1849). The illustrations were by Nicolas-Henri Jacob (1781-1871).
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