The temporal bone is a skeletal structure above the human skull. There is a bony protrusion called the mastoid process above the temporal bone, which is located behind the human ear, and when touched with the hand, a more prominent skeletal structure will be touched, which is the mastoid process of the human body, and this location is also part of the human temporal bone. The mastoid is the attachment point of the muscle. The mastoid is named after its shape, and its protrusion is oblique to the bottom. The mastoid in adult males is relatively larger than the mastoid in adult females, and the muscle attached to it, which is well known, is the sternocleidomastoid muscle of the human body, and the lower end of the sternocleidomastoid muscle is attached to the sternoclavicular joint of the human body.