Bone Tissue

• rigid support
• protection
• aid in movement
• site of blood cell formation (hematopoiesis)
• storage for chemicals (calcium)

• osteocytes
• osteoblasts
• osteoclasts

mature bone cells, reside in lacunae, develop from osteoblasts that have become surrounded by matrix (maintain bone matrix)

• cells that produce fibers and ground substance
• secrete a matrix (osteoid)
• eventually they secrete enough to surround themselves in a lacunae and become osteocytes
• Found on the surface of any developing bone area

• large, multinuclear phagocytic cells capable of degrading and reabsorbing matrix
• appear to be derived from bone marrow cells
• found on surface of bone area being reabsorbed
• NOT a progression of osteocytes

made up of organic and inorganic substances

• collagen fibers
• ~1/3 - flexibility and tensile strength

• hydroxyapatite crystals made of calcium phosphate, calcium carbonate, and calcium hydroxide
• ~2/3 - compression strength

• compact (dense) bone
• spongy (cancellous) bone

• found on surface of all bone tissue and provides rigid support and strength
• components arranged by Haversian system, which includes the osteon as the basic function and structural unit

• basic functional and structural unit of dense bone tissue found in the Haversian system.
• Components include lacunae, caniliculi, lamellae, central (Haversian) canal, and perforating (Volkman's) canal

space for osteocyte

minute canals radiating in all directions from lacunae allowing for communication between adjacent osteocytes

concentric, ring like arrangement of layers of bone tissue

contains blood vessels and nerves

perpendicular channels connecting Haversian canals

• bone tissue characterized by forming trabeculae (spicules)
• contains red bone marrow in heads of humerus and femur, vertebrae, sternum, pelvis, and cranial bones.

• refers to the lattice-like arrangement of bone tissue found deep to compact bone
• localized to epiphyses (ends) of long bones and in short, flat, irregular bones