The lower part of the shoulder is relatively broad. The lower part of the outer part of the shoulder is the upper arm, which is where the biceps and triceps attach, and inside is the humerus. The posterior lower part of the shoulder is the scapular region, including the scapula, which has the supraspinatus, infraspinatus, teres minor and teres major, and the anterior part of the shoulder is mainly the pectoralis major and minor muscles, as well as the thoracic fascia. The most common clinical pain below the shoulder is in the scapular region, mainly due to frozen shoulder, often accompanied by limited movement of the shoulder joint.