Image:Diaphragm Arthur Keith 1.jpg

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| description = Figs. 1, 2, 3 -- Diagrams illustrating the origin of the diaphragm and pleural cavities. Fig. 1, the amphibian body-cavities; fig. 2, the corresponding cavities in a bird; fig. 3, in a mammal. a, mandible; b, genio-hyoid; c, hyoid; d, sterno-hyoid; e, sternum; f, pericardium; g, septum transversum; h, rectus abdominalis; i, abdominal cavity; j, pubis; k, œsophagus; l, trachea; m, cervical limiting membrane of abdominal cavity; n, dorsal wall of body; o, lung; o', air-sac.

| source = From "The nature of the mammalian diaphragm and pleural cavities", Arthur Keith, M.D., Journal of Anatomy and Physiology, 1905.[https://books.google.com/books?id=2ecDAAAAYAAJ]

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