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Endocast
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<p>An endocast is the internal cast of a hollow object, often referring to the <a href="/facts/Cranial_vault/y4TW0SDC">cranial vault</a> in the study of brain development in humans and other organisms. Endocasts can be artificially made for examining the properties of a hollow, inaccessible space, or they may occur naturally through <a href="/facts/Fossil/by7NzIA1">fossilization</a>. </p>