brachioradialis fold dynamic


Hi guys, I’m posting this question because there seems to be little information about this specific dynamic and it confuses me a little.
anyone can explain what exactly happens to the brachioradialis muscle and to the extensor carpi radialis longus when the lower arm is pulled all the way to the upper arm?
does it folds?, if that is so, how does it folds?, does it keep it’s shape under the skin and fat?.
If anyone can shed some light or point to a reference on this I would really appreciate it!


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