Longitudinal Section of Body

Diagrammatic longitudinal section of the body. Labels: a, the neural tube, with its upper enlargement in the skull cavity at a’; N, the spinal cord; N’, the brain; ee, vertebrae forming the solid partition between the dorsal and ventral cavities; b, the pleural, and c, the abdominal division of the ventral cavity, separated from one another by the diaphragm, d; i, the nasal, and o, the mouth chamber, opening behind into the pharynx, from which one tube leads to the lungs, l, and another to the stomach, f; h, the heart; k, a kidney; s, the sympathetic nervous chain. From the stomach, f, the intestinal tube leads through the abdominal cavity to the posterior opening of the alimentary canal.

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