the.com/sternum

the bony lid keeping your heart from making a run for it

means The flat, vertical bone running down the center of your chest, to which most of your ribs attach.

from From Greek 'sternon,' meaning the chest or breastbone — possibly tied to a root suggesting something spread out or broad, fitting for this flat plate of bone. It came into anatomical Latin and then English largely as a medical borrowing, the kind of word that stays Greek because doctors like it that way.

marrow factory
Pumps out blood cells your whole life
three parts
Fuses from separate bones during childhood
surgeon's door
Sawed open to reach the heart
xiphoid tip
Lowest point stays cartilage for decades
CPR target
Compressions push directly on it
for instance

andy warhol's sternum scar — artist shot in the chest in 1968, visible scar remained his entire life

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