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The Human Body

Author(s): Deanne Erdmann MS

Compact Bone Tissue

Nearly two-thirds of bone is made of various salts, primarily compounds containing phosphorus and calcium, which provide rigidity and hardness. Collagen makes up the remainder of the matrix (nonliving portion of bone tissue). New bone is produced by osteoblasts, which secrete collagen. After the calcium phosphate is deposited in the matrix, some of the osteoblasts become trapped in their own secretion and then are called osteocytes (osteo = bone, cyte = cell). Bone is a dynamic tissue and constantly is reorganized by cells called osteoclasts. Severe bone loss is called osteoporosis.

Compact bone consists of concentric rings of calcium and other minerals (lamellae) surrounding a haversian canal (containing blood vessels and nerves that support the osteocytes). The circular structure helps to form columns that allow the bone to withstand stress, forming a basic structure of compact bone called a Haversian system.