Bone penetrating the skin and being exposed to the outside can be both a natural process in some animals, and due to injury:
- A deer's antlers are composed of bone.
- Instead of teeth, the extinct predatory fish Dunkleosteus had sharp edges of hard exposed bone along its jaws.
- A compound fracture occurs when the edges of a broken bone puncture the skin.
- Though not strictly speaking exposed, a bird's beak is primarily bone covered in a layer of keratin over a vascular layer containing blood vessels and nerve endings.
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Famous quotes containing the words bone and/or exposed:
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Who all his life collected bones,
Till Death, that grim and boney spectre,
That universal bone collector,
Boned old Jones, so neat and tidy,
And here he lies, all bona fide.”
—Anonymous. Epitaph on William Jones, from Eleanor Broughtons Varia (1925)
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—Bruno Bettelheim (20th century)