Pump-handle is a movement of the
ribs that results in a change in the anteroposterior diameter of the
thorax
The thorax or chest is a part of the anatomy of humans, mammals, and other tetrapod animals located between the neck and the abdomen. In insects, crustaceans, and the extinct trilobites, the thorax is one of the three main divisions of the cre ...
.
[ ]
Definition
One of the most important functions of the
ribs and
diaphragm is the change in volume of the
thorax
The thorax or chest is a part of the anatomy of humans, mammals, and other tetrapod animals located between the neck and the abdomen. In insects, crustaceans, and the extinct trilobites, the thorax is one of the three main divisions of the cre ...
that helps
inspiration and
expiration
Expiration or expiration date may refer to:
Expiration
Expiration may refer to:
*Death
*Exhalation of breath, breathing out
*Expiration (options), the legal termination of an option to take an action
*Shelf life, or the time after which a product ...
. 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
The costovertebral joints are the joints that connect the ribs to the vertebral column. The articulation of the head of the rib connects the head of the rib to the bodies of the thoracic vertebrae.
Structure
The costotransverse joint connects t ...
2 to 6 about a side-to-side axis results in raising and lowering the
sternal
The sternum or breastbone is a long flat bone located in the central part of the chest. It connects to the ribs via cartilage and forms the front of the rib cage, thus helping to protect the heart, lungs, and major blood vessels from injury. Sh ...
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.
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See also
*
Bucket handle movement
Bucket-handle is a movement of ribs that results in change in transverse diameter of the thorax.
Definition
One of the most important functions of ribs and diaphragm is the change in volume of thorax that helps inspiration
Inspiration, inspire, ...
References
*http://www.duhs.edu.pk
{{Reflist
External links
Thorax (human anatomy)
Respiration