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Updated: June 29, 2025
The internal intercostals are attached between the inner margins of adjacent ribs, and they extend obliquely downward and backward from the front. The contraction of the external intercostal muscles raises the ribs, and the contraction of the internal intercostals tends to lower them. As the front is raised the space between the uprights is increased.
"If your intercostals were somewhat sore for a time, on account of a contact with priestly knuckles, doubtless there soon set in a corresponding uneasiness in the region of your conscience. Such shocks are often vigorously alterative and tonic eh, my son?" "You jolted me sober, Father, and then I was ashamed of myself. But where does all your tremendous strength lie? You don't look strong."
The intercostal muscles, which form two thin layers between the ribs, known as the internal and the external intercostal muscles. The external intercostals are attached between the outer lower margin of the rib above and the outer upper margin of the rib below, and extend obliquely downward and forward.
The walls of the chest being movable, by the contractions of the intercostals and other muscles, the ribs are raised and the breastbone pushed forward. The chest cavity is thus enlarged from side to side and from behind forwards.
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