Which structure attaches bone to periosteum to anchor it during growth and repair?

Which structure attaches bone to periosteum to anchor it during growth and repair?

• A. Sharpey's fibers
• B. Endosteum
• C. Osteon
• D. Lacunae

Answer: (A)

Sharpey's fibers are perforating collagen fibers that extend from the outer layer of the periosteum into the bone matrix, anchoring the periosteum to the bone surface. This connection helps transmit mechanical stresses and provides stability during growth and fracture repair, while allowing the periosteum’s osteogenic cells to participate in bone remodeling. The endosteum lines the inner surfaces of bone, not the outer surface attachment; an osteon is the structural unit of compact bone; lacunae are small cavities that house osteocytes—none of these attach the periosteum to bone.

Sharpey's fibers are perforating collagen fibers that extend from the outer layer of the periosteum into the bone matrix, anchoring the periosteum to the bone surface. This connection helps transmit mechanical stresses and provides stability during growth and fracture repair, while allowing the periosteum’s osteogenic cells to participate in bone remodeling. The endosteum lines the inner surfaces of bone, not the outer surface attachment; an osteon is the structural unit of compact bone; lacunae are small cavities that house osteocytes—none of these attach the periosteum to bone.