That texture there is incorrect Jinx, Biceps and Triceps have in and out as well since it's a box, when you dismember the wrist, you can see the out texture you put there on the tip, if you dismember the triceps, you can see the out texture for the biceps, similarly, if you somehow distort the shoulder from the biceps, or the elbow from the triceps, you can see the in texture for those. That template you put there was old when there was "lack of knowledge" on these parts.