surface anatomy landmarks for structures in superior mediastinum (4) things occur by (3) landmark locations

posterior to 1st right costal cartilage (CC)

formation of superior vena cava by right and left brachiocephalic veins

posterior to 2nd right CC

arch of azygos vein joins Superior vena cava

posterior to 3rd right CC

superior vena cava enters right atrium

Posterior to sternoclavicular joint

formation of brachiocephalic veins by internal jugular and subclavian veins,

then division of brachiocephalic trunk to its branches on the right side

name the 5 visceral branches of the thoracic aorta

oesophageal arteries

bronchial arteries (2 left 1 right)