The muscles connecting the neck to the shoulders are the neck muscle groups, including the trapezius, sternocleidomastoid, and scapularis, etc. The muscles connecting the neck to the shoulders are the cervical muscle groups. 1. Trapezius: The trapezius muscle is located at the neck and back, divided into two sides with the spine as the center, each side is a triangle, and both sides form a rhomboid. The trapezius muscle is long and is not only a muscle that connects the neck to the shoulder, but also serves to suspend the shoulder girdle bone. 2. Sternocleidomastoid: Sternocleidomastoid is a muscle on both sides of the neck, which is mainly responsible for head and neck rotation, and it starts from the sternal end of the clavicle and ends at the mastoid process of the temporal bone, so it is called sternocleidomastoid muscle. 3. Scapular Tibialis Muscle: Scapular Tibialis Muscle is located on both sides of the neck, from the sternocleidomastoid muscle deep side, down to the deep surface of the trapezius muscle, which has the effect of lifting up the scapula, is the cervical spine is a more important piece of muscle. Neck connecting shoulder muscles play different roles, if the part of the muscle discomfort, it is recommended to seek medical attention in a timely manner.