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This is interesting. I am rh negative and I have the palmaris longus also. Incidentally, I wasn't sure until I saw an image that helped me. Touch your pinky and thumb then bend the wrist around. It makes it clearer. I assume you are rh negative also? I don't remember seeing it in your OP. Even if it's not linked to only rh factor, it still is very interesting that only a few people have it.
Our book says this muscle is absent in about 15% of the population. I couldn't help but make a connection with 15% of the population has rh negative blood. - See more at: www.abovetopsecret.com...