Confused about low arm muscles

Hey guys

I was reading and drawing from Andrew Loomis book "Figure drawing" ...

In his drawings are these muscles : Supinator Longus followed by Extensor Carpi Radialis...

But in the video tutorial called organic modeling by Freedom of Teach, the guys says Extensor Carpi Radialis followed by Brachioradialis , and he does not mention this muscle : Supinator Longus.Is that muscle in the inside of the arm or what?

Help this anatomy newbie guys

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