Mammoth Memory

Intercostal muscles

The intercostal muscles are a group of muscles found in between the ribs. They allow the ribcage to move during ventilation (breathing in and out).

The intercostal muscles allow the ribs the move with the lungs while breathing

The mussel (muscle) is really into costumes (intercostal) and it hangs all its costumes on the ribs.

 Magnification showing the structure of the intercostal muscles in the rib cage

When you inhale, the external intercostal muscles contract and the internal intercostal muscles expand the ribcage, moving it up and outwards. When you exhale, the external intercostal muscles relax and the internal ones contract, moving the ribcage inwards and downwards.

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