Most metabolically active layer in the bone is:
(A) Periosteum (B) Endosteum (C) Cancellous bone (D) Coical bone
(B) Ans: B. Endosteum (Ref Osteoporosis and Bone Densitomeny Measurements edited by Giuseppe Guglielmi/ p72)The most metabolically active component of bone is the endosteal surface of coex with trabecula bone being next most common active area .Metabolically active layer in bone:Are in immediate contact with bone marrowEndosteum of coex - Most active layer in bone (overall).Total area of endosteal surface approximately 0.5 m2.Higher remodelling activity than periosteal surface -Due to greater biomechanical strain or greater cytokine exposure from adjacent hone marrow compament.Order:Trabecular bone - Next most metabolically active area.In children = Periosteum is very active.