From the front, the lower part of the neck is right in the middle of the sternum. There is a depression in the upper sternum, and deeper down is the esophagus and other more important structures, and then on either side is the clavicle, which is often called the clavicle and protrudes more prominently in some people. Above the clavicle there are two depressions called supraclavicular recesses. Deep on either side of the neck are the carotid artery, the jugular vein, and the vessels of the common artery, the common vein, and the superior and inferior clavicular arteries. Considered further to the sides are the more pronounced muscles such as the sternocleidomastoid muscle, and then to the sides are the shoulders on either side and the shoulder joints on either side. From the back, just below the center is the thoracic vertebra, the spinous process, which protrudes more obviously in some people and less obviously in others. Then on both sides are mainly rich muscles such as the latissimus dorsi, scapularis, and rhomboid muscles. If the head is lowered for a long time or the posture is not correct, it will lead to a feeling of muscle pain and swelling.