The Respiratory System - Slide 35
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Internal intercostal muscles have been removed revealing internal
thoracic arteries (red) and veins (blue) lateral
to sternum and the parietal (costal) part of the pleural
membrane. As external intercostal muscles approach the ventral
thoracic wall, they rapidly become less muscular and more aponeurotic
in nature, and at distances 4 cm or more from the chondro-osseous
union.
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