What is the name of the muscle that extends from the collarbone to the temporal bone behind the ear and rotates and bends the head?

The muscle that extends from the collarbone (clavicle) to the temporal bone behind the ear, playing a crucial role in rotating and bending the head, is known as the Sterno-Cleido-Mastoid. This muscle is prominently involved in neck movements, enabling actions such as turning the head from side to side and flexing the neck forward.

Originating from both the sternum (sterno) and the clavicle (cleido), it attaches to the mastoid process of the temporal bone located behind the ear. This anatomical structure allows for its functionality in head movement and has significant importance in various activities such as looking around, nodding, and even maintaining posture. Other muscles listed may play roles in the neck or head but do not have the same specific attachments or primary functions as the Sterno-Cleido-Mastoid in this context.