From Head to Toe, 29

Head to Toe:

Boning Up on the Bones of the Body

Arm (d): clavicle

Your collar bone—so apt a name:
It’s by your collar (much the same).

Your clavicle—the science term

For this fine bone—so shapely, firm.

It’s also near the surface, so

It breaks too much (so sad, I know).

But all things heal—sure, some just don’t—

Mortality is one that won’t.