The external intercostal muscles, or external intercostals Intercostales externi are eleven in number on both sides. Contents. [hide]. 1 Structure; 2 Variations; 3 Additional images; 4 See also; 5 References. Structure. A cutout of the thoracic wall showing the three layers of intercostal muscle - from the left wall..Wikimedia Commons has media related to Intercostal muscle. Intercostal muscle. external internal innermost subcostalis transversus thoracis levatores costarum; serratus posterior. inferior superior thoracic diaphragm Thoracic cavity pectoralis major pectoralis minor subclavius .
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The electrical activity of the external and internal intercostal muscles was recorded in decerebrated cats during eupnea and in the course of dyspnoea artificially .
There are three principal layers; External intercostal muscles aid in quiet and forced inhalation. They originate on ribs 1-11 and have their insertion on ribs 2-12..
Right superior intercostal vein. The right superior intercostal vein drains the 2nd, 3rd, and 4th posterior intercostal veins on the right side of the body..
Continued From Above Each rib is connected to the rib below it by both an external and internal intercostal muscle. The twelfth rib is the exception as it is the .