GENERAL HISTOLOGY

Detailed explanation-1: -The outer covering of the bone is known as the periosteum; the periosteum covers the whole surface of the bone except at the ligament attachment, tendon attachment, and an area covered by articulating cartilage. The periosteum is absent in sesamoid bones.[9][10]

Detailed explanation-2: -The periosteum consists of an outer fibrous layer, and an inner cambium layer (or osteogenic layer). The fibrous layer is of dense irregular connective tissue, containing fibroblasts, while the cambium layer is highly cellular containing progenitor cells that develop into osteoblasts.

Detailed explanation-3: -The periosteum is a complex structure composed of an outer fibrous layer that lends structural integrity and an inner cambium layer that possesses osteogenic potential. During growth and development it contributes to bone elongation and modeling, and when the bone is injured, participates in its recovery.