Structures at Angle of Louis
Sternal angle/Louis angle:It is felt as a transverse ridge about 5cm below the suprasternal notch.It marks the manubriosternal joint and lies at the level of the second costal cailage anteriorly and the disc between the fouh and fifth thoracic veebrae posteriorly.This is an impoant landmark for many reasons.The arch of aoa begins and also ends at this level. BD CHAURASIA'S HUMAN ANATOMY UPPER LIMB THORAX SIXTH EDITION VOLUME 1.PAGE NO187
Arch of aoa
Azygous vein
Common carotid aery
Clavicle
Thorax