Final answer:
Fontanels are soft spots in the skull of infants that allow for continued growth and flexibility as the bones gradually ossify.
Explanation:
Fontanels are the soft spots between the bones of the skull in infants where bone formation isn't complete. These regions are filled with fibrous connective tissue and allow for continued growth and flexibility of the skull after birth. They gradually ossify as the infant grows, closing the soft spots.
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