The plural of endosteum; the inner lining membrane of bones, also called the endosteal surface or inner periosteum.
Plural form from endo- (within) + ostea (bone-related), from Greek osteon (bone). Used in anatomical texts since the 1800s to describe bone's internal surfaces and tissues.
Your bones aren't solid—they have an entire inner scaffolding lined with endostea that houses bone marrow and blood vessels, making them living, growing organs!
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