scapular line scapular line the scapular line, also known as the linea scapularis, is a vertical line passing through the inferior angle of the scapula. scapular linesurface anatomy of the back. (inferior angle of scapula labeled at bottom center.)posterior view of the thorax and shoulder girdle.detailsidentifierslatinlinea scapularista98a01.2.00.020ta268fma14613anatomical terminology it has been used in the evaluation of brachial plexus birth palsy.