A 43 year old female client presents with pain in the right hand with episodes...

A 43 year old female client presents with pain in the right hand with episodes of pins and needles and occasional numbness. Upon inspection you notice a slight bluish discoloration of her arm and sensitivities of her right anterior neck. She claims to be under a lot of stress at work and she has been working overtime lately at a desk job typing 8-10 hours a day. What muscle group is directly contributing to this condition?