Living anatomy : rib counting
- The angle of Louis (also called the sternal angle) is a useful place to start counting ribs, which helps localize a respiratory finding horizontally.
- If you find the sternal notch, walk your fingers down the manubrium a few centimeters until you feel a distinct bony ridge.
- This is the sternal angle. The 2nd rib is continuous with the sternal angle; slide your finger down to localize the 2nd intercostal space.
- The angle of Louis also marks the site of bifurcation of the trachea into the right and left main bronchi and corresponds with the upper border of the atria of the heart.
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