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I and O of thorax

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kodopumi's version from 2015-12-09 21:25

Origins Insertions And Actions of Muscles of the Thorax

 

MuscleOriginInsertionAction
Serratus anterioron the upper eight or nine ribson scapulapulls scapula forward and downward
External intercostalson inferior border of the lower part of the ribson superior border of the upper part of the ribselevate and draw the ribs together
Internal intercostalson superior border of ribson inferior border of rib abovedraws ribs together and depresses thorax (used in forced expiration)
Diaphragmon xiphoid process of sternumon central tendon ( which is in the middle of the diaphragm, surrounded by diaphragm muscle)contracts downward, and increases the vertical size of the thorax
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