The Respiratory System - Slide 33
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Internal intercostal muscles, which course down and laterally
in front, occupy the chondral and adjacent osseus portion of the
rib cage.
External intercostal muscles are seen lateral to internal intercoswtal
muscles coursing downward and medially directed in front.
Note the axillary artery (red) and vein (blue),
and brachial plexus (white).
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