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diaphragm
(di“ә-fram)
the musculomembranous partition separating the thoracic and abdominal cavities. On its sides it is attached to the six lower
ribs, at its front to the sternum, and at its back to the spine. The esophagus, aorta, vena cava, and numerous nerves pass
through the diaphragm. When relaxed it is convex, but it flattens as it contracts during inhalation, thereby enlarging the
chest cavity and allowing for expansion of the lungs. adj., diaphragmat“ic., adj.
any separating membrane or structure.
a disk with one or more openings or with an adjustable opening, mounted in relation to a lens or source of radiation, by which
part of the light or radiation may be excluded from the area.
Copyright 2007. An Elsevier publication. All rights reserved.
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