bucket handle movement
{{Short description|Respiratory movement}}
Bucket-handle is a movement of ribs that results in change in transverse diameter of the thorax.{{cite web|url=http://www.oganatomy.org/projanat/gross/28/six.htm|title=28 : The Chest Wall and Pleura|website=www.oganatomy.org}}
Definition
One of the most important functions of ribs and diaphragm is the change in volume of thorax that helps inspiration and expiration.Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students. Philadelphia: Elsevier/Churchill Livingstone. {{ISBN|978-0-8089-2306-0}}. In general, the ribs move around two axes.{{cite web|url=https://www.dartmouth.edu/~humananatomy/part_4/chapter_20.html|title=Chapter 20: The thoracic wall and mediastinum|website=www.dartmouth.edu|access-date=2015-06-29|archive-date=2017-12-06|archive-url=https://web.archive.org/web/20171206060551/http://www.dartmouth.edu/~humananatomy/part_4/chapter_20.html|url-status=dead}} As the anterior end of ribs is about 4 cm lower than the posterior end, the middle part of rib is lower than anterior and posterior ends. Movement at costovertebral joints 7 to 10 about an anteroposterior axis results in raising and lowering the middle of the rib, the Bucket-handle movement. In elevation, this increases the transverse diameter of the thorax.{{cite web|url=http://www.dartmouth.edu/~humananatomy/figures/chapter_20/20-7.HTM|title=Figure 20-7|website=www.dartmouth.edu|access-date=2015-06-29|archive-date=2016-07-29|archive-url=https://web.archive.org/web/20160729035325/http://www.dartmouth.edu/~humananatomy/figures/chapter_20/20-7.HTM|url-status=dead}}