The diaphragm: two muscles.
The costal and crural parts of the diaphragm were separately stimulated in anesthetized dogs. Stimulation of the costal part increased the dimensions of the lower rib cage, whereas stimulation of the costal part decreased the dimensions of the lower rib cage. It is concluded that the diaphragm consists of two muscles that act differently on the rib cage.
D000005:Abdomen; D000818:Animals; D003964:Diaphragm / Q000502:physiology*; D004285:Dogs; D004558:Electric Stimulation; D008168:Lung / Q000502:physiology; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000502:physiology*