The vascular elements of the marrow tissue actively invade the cartilage above, leaving spicules of calcified cartilage, upon which bony matrix will be deposited.

• 图中可见，骨髓组织不断侵嗜软骨，留下梁状的钙化软骨组织，随后这些残留软骨组织表面便会被骨组织覆盖包裹。