Is the back part of the upper arm have any body heat retention significance?

I notice that I always get cold on the back part of my upper arms first and I always cover them first in order to warm up. I have also noticed that people hold their upper arms (crossing their arms) when they are cold. I wanted to know if this part of the body is instramental in body heat rentention like our head and our feet are or if getting cold here first is inidicative of some health problem like bad circulation. I was just curious. Thanks.
Answer:
Heat dissipation comes out of the top part of the body...like you were saying

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