Stomach. 19th century artwork showing the muscular coat of the stomach. There are three sets of smooth muscle fibres covering the gastric surface. The outermost layer is made up of longitudinal fibres, which run from the oesophageal opening (top centre) to the duodenal opening (left). Beneath this are the circular fibres, which form rings around the stomach, and beneath these in the top half are the oblique fibres that run diagonally. This anatomical artwork is plate 19 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).