骨元(英语:osteon)或哈弗斯系统(英语:haversian system ),亦称骨质,是密质骨的基本功能单元。骨单位是大致圆柱形的结构,通常长几毫米, 直径约0.2毫米。 它们存在于大多数哺乳动物的许多骨骼以及某些鸟类,爬行动物和两栖动物中。[1]
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