What forms just deep to the periosteum after woven bone develops in intramembranous ossification?

What forms just deep to the periosteum after woven bone develops in intramembranous ossification?

• A. Lamellar bone
• B. Compact bone
• C. Fibrous membrane
• D. Cartilage

Answer: (A)

In intramembranous ossification, bone starts as woven bone laid down by osteoblasts from mesenchyme, which is initially relatively disorganized and weak. Over time, this woven bone is remodeled and replaced with lamellar bone, which has organized, parallel layers of collagen fibers (lamellae) that give it much greater strength. Just beneath the periosteum, the outer surface of the developing bone is formed as this lamellar bone, creating the compact, mature bone layer under the membrane. Cartilage isn’t involved in this pathway, and the periosteum itself is the surrounding fibrous layer, not the tissue that forms inside. So the tissue that forms just deep to the periosteum after woven bone develops is lamellar bone.

In intramembranous ossification, bone starts as woven bone laid down by osteoblasts from mesenchyme, which is initially relatively disorganized and weak. Over time, this woven bone is remodeled and replaced with lamellar bone, which has organized, parallel layers of collagen fibers (lamellae) that give it much greater strength. Just beneath the periosteum, the outer surface of the developing bone is formed as this lamellar bone, creating the compact, mature bone layer under the membrane. Cartilage isn’t involved in this pathway, and the periosteum itself is the surrounding fibrous layer, not the tissue that forms inside. So the tissue that forms just deep to the periosteum after woven bone develops is lamellar bone.