The scapula is located on the posterior outside of the thorax, between the 2nd and 7th ribs. The scapula is a triangular flat bone located outside the posterior thorax, dorsal to the upper chest, between the 2nd to 7th ribs, and symmetrical on both sides. It is divided into two sides, three margins and three corners. The ventral or ribbed side, opposite the thorax, is a large shallow fossa called the subscapular fossa. The transverse ridge on the dorsal surface is called the scapular gland. The shallow fossae above and below the冈 are called the supragonal and infragonal fossae, respectively. The superior margin is short and thin, with a lateral finger-like projection, the rostral process, the medial margin is the spinal margin, and the lateral margin is adjacent to the axillary fossa and is called the axillary margin. The upper angle of the scapula is flat against the 2nd rib and the lower angle is flat against the 7th rib when the upper limb is pendulous. The vertical line through the lower angle is the scapular line, which is an important landmark of the chest.