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A Diagrammatic section across the body in the chest region. Labels: x, the dorsal tube, which contains the spinal cord; the black mass surrounding it is a vertebra; a, the gullet (esophagus), a part of the alimentary canal; h, the heart; sy, sympathetic nervous system; ll, lungs; the dotted lines around them are the pleurae; rr, ribs; st, the breastbone.

Section Across the Body in the Chest Region

A Diagrammatic section across the body in the chest region. Labels: x, the dorsal tube, which contains…