During the growth phase, bone receives numerous osteogenous cells (osteoblasts),
which then diminish in adults, not reappearing until a bone is broken and
renewed cell formation is required. The outer layer of the periosteum
consists of a network of high-tensile fibers, anchoring it directly to the
bone. It serves to secure tendons, muscles and ligaments. The periosteum
is supplied by blood vessels, lymph vessels and nerves. Bone - with the
exception of dentin is the hardest substance within the human body.
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