Describe the movement of the pail
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During inspiration, the lateral dimensions of the thoracic cavity are increased by the 6
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ribs moving laterally similar to bucket handles. In inspiration, the transverse diameter is increased by ribs swinging outwards (bucket handle movement), elevation of the ribs and elevation of the sternum. This is achieved mainly by the contraction of the external intercostal muscles.
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Bucket-handle is a movement of ribs that results in change in transverse diameter of the thorax.[1]
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