The spongy bone tissue layer sandwiched between the two dense outer layers of bone in the skull.
From Greek 'diploe' (double/fold), describing the layered structure. This anatomical term has been used since ancient times as scientists studied skull structure.
Your skull's diploe acts like a biological shock absorber — it's full of tiny air spaces that make your head lighter while still protecting your brain, which is why the brain is so well-cushioned.
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