Pump handle movement
{{Short description|Respiratory movement}}
Pump-handle is a movement of the ribs that results in a change in the anteroposterior diameter of the thorax.{{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 |url-status=dead |archive-url=https://web.archive.org/web/20050226030903/http://www.dartmouth.edu/~humananatomy/part_4/chapter_20.html |archive-date=2005-02-26}}
Definition
One of the most important functions of the ribs and diaphragm is the change in volume of the 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. The anterior end of the rib is lower than the posterior end; therefore, during elevation of the rib, the anterior end also moves forwards. Movement at costovertebral joints 2 to 6 about a side-to-side axis results in raising and lowering the sternal end of the rib, the "pump-handle" movement. This occurs mostly in the vertebrosternal ribs. In elevation, this increases the anteroposterior 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 |url-status=dead |archive-url=https://web.archive.org/web/20061208212305/http://www.dartmouth.edu/~humananatomy/figures/chapter_20/20-7.HTM |archive-date=2006-12-08}}
See also
References
- http://www.duhs.edu.pk
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External links
- [http://www.medicalexplorer.org/preview/index.php?ch=2&fig=3&s=24]