external intercostal muscles

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external intercostal muscles

The outer layer of muscles between the ribs, originating on the lower margin of each rib and inserted on the upper margin of the next rib. During inspiration, they draw adjacent ribs together, pulling them upward and outward, and increasing the volume of the chest cavity. They are controlled by the intercostal nerves.
See also: muscle
References in periodicals archive ?
Managing the breath requires maintaining the efforts of expansion, largely accomplished by contracting the external intercostals.
Agonist intercostals in the parasternal region and lower external intercostals also have a large inspiratory mechanical advantage [3-4], and they contract in a predictable manner at rest [1,5].
Of the intercostal segments, the midthoracic external intercostals are best understood, and they have been found to atrophy [11] and hypertrophy [12] in clinical diseases and conditions that often occur in conjunction with chronic changes in inspiratory motor activity.
Example: The internal and external intercostals are located between the ribs and have the duties of stabilizing the framework of the rib cage and assisting with respiration.
When singing, one attempts to retard this motion by continuing to engage the external intercostals during exhalation.
It is correct that the muscles of inspiration, especially the external intercostals, can remain contracted during the first portion of expiration, to keep the air from being expired too quickly.
Since contraction of either the diaphragm or the external intercostals during exhalation will help minimize subglottal air pressure, use of either muscle achieves the same goal.

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