Immature Bone

**Semantic type:** Tissue

**Definition:** The earliest tissue to appear in embryonic development (it is the predominant bone in the developing fetus) and post fracture. The collagenous lamellae are randomly oriented and loosely intertwined. It is characterized by coarse fiber bundles approximately 30 um in diameter.

**Synonyms:** - Bundle Bone - Nonlamellar Bone - Woven Bone