External intercostal muscles

EXTERNAL intercostal muscles

SHORT DESCRIPTION

• They are occupying the intercostal spaces and are facing downward and backward, leaving the latter part of the intercostal space.
• They are 11 and there in the front.
• The back specializes in a muscle called supracostal, which is fixed to the transverse processes of the thoracic vertebrae.
• Their insertions occur through muscle and tendon fibers.

ORIGIN

• outer lip of the costal groove of the upper rib intercostal space.

INSERTION

• outer lip of the upper edge of the underlying rib.

OCUPA

• then begins to costotransverse joint.
• It was previously stopped in the vicinity of the costocondral joint, and continue with the external intercostal membrane.

INNERVATION :  Intercostal nerves Correspondents.

FUNCTION

• Rib tend to rise, pulling the upper raise the bottom. This occurs whenever the 1st or 2nd rib are fixed by the scalene.

                                   

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