Models parts move where they shouldn't
Hi, I'm having a problem with animation in Maya. When ever I have made a model of a human character, and animate it using bones and joints, I move the model's arms down in a casual position, and some parts that are close to the model's arms (like the head, hair, and eyes) move also. Plus the textures get very distorted. If someone knows a way of fixing this problem, it would be greatly appreciated.