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When looking at Wikipedia, I read that the interosseus muscle is actually composed of 3 muscles, but on the French Wikipedia, they talk about a 4th muscle.

So how many interosseus muscle components are there, 3 or 4?

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The number of interosseous muscles is not constant, because of the evolutional process continuing in modern generations.

Some individuals have 4 interosseous muscles, other have three, however there are still debates about the subject:

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