Yikes I donno bro that would be the last place I would think of, you heard good things about pinning there? I would say lift up your arm flex and jab it in the upper portion but again I don't know how safe a place it is to pin.
I was assuming I could because of the size of the muscle but just wouldn't know the best way to keep it relaxed. It would give me 2 more spots if it goes right. Quads are a no no for me
Here you go, I have never injected there nor would I ever. I always stick to delts, glutes and thighs. This chart tells you how to inject.http://www.spotinjections.com/index3.htm