A middle scalene is a type of muscle located in the neck. It is part of the scalene muscles, which include the anterior, middle, and posterior scalene muscles. The middle scalene muscle helps in the movement of the neck and assists with breathing by elevating the first rib. This muscle originates from the cervical vertebrae and inserts into the first rib. It plays a role in stabilizing the neck and can be involved in various movements, such as bending the neck to the side. Issues with the middle scalene can lead to discomfort or pain in the neck and shoulders.