Chapter 5: (5.1) Bone & Skeletal Tissue

What type of tissue is bone?

• Epithelial

• Connective

• Nervous

• Muscle

What are the functions of the skeletal system?

• Support = structural framework for muscle attachment

• Protection & triglyceride storage = yellow bone marrow + storage of fat

• Assistance in movement = skeletal muscles attach and can cause movement

• Calcium homeostasis = storage and release of calcium

• Blood cell production = red bone marrow produces white & red blood cells to undergo hemopoiesis (production of blood cells & platelets)

Compact Bone is found in:

• Strong, dense outer layer of bones

• Ends of long bone under/inside the compact bone

• Osteocytes and osteoblast groupings

• Trabeculae

Spongy Bone is found in:

• Strong, dense outer layer of bones

• Ends of long bone under/inside the compact bone

• Osteocytes and osteoblast groupings

• Trabeculae

What is the basic structural unit for COMPACT BONE?

• Osteoctyes, osteoblasts, & osteoclasts

• Lamellae = ring-like area within osteons that are covered with collagen fibers = flexibility + tensile strength

• Trabeculae = weaker honeycomb framework

• Osteon = compression & strength = supports weight + tension/Haversian System

What is the basic structural unit for SPONGY bone?

• Osteoctyes, osteoblasts, & osteoclasts

• Lamellae = ring-like area within osteons that are covered with collagen fibers = flexibility + tensile strength

• Trabeculae = weaker honeycomb framework

• Osteon = compression & strength = supports weight + tension/Haversian System

What do spongy and compact bone have in common?

• Both are found in the inner layer at the ends of long bone

• Both are found in the strong, dense outer layer

• Both have osteocytes, osteoblasts, and osteoclasts

• Both have lamellae which is a ring-like area within the osteons that are ocvered with collagen fibers for flexibility & tensile strength

Osteogenic stem cells are:

• MATURE bone cells that maintain bone matrix = live in lacunae: small hole-like spaces in bone tissue

• Immature bone cells that make new bone matrix & more active in bone DEPOSITION (depositing/osteogenesis/bone formation)

• cells that can make NEW bone cells in periosteum (outside membrane of bone) & endosteum (lining inside of the medullary cavity)

• Immature bone cells that DESTROY bone by dissolving bony matrix & are more active in bone RESORPTION (breakdown/carving)

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Osteocytes are:

• MATURE bone cells that maintain bone matrix = live in lacunae: small hole-like spaces in bone tissue

• Immature bone cells that make new bone matrix & more active in bone DEPOSITION (depositing/osteogenesis/bone formation)

• cells that can make NEW bone cells in periosteum (outside membrane of bone) & endosteum (lining inside of the medullary cavity)

• Immature bone cells that DESTROY bone by dissolving bony matrix & are more active in bone RESORPTION (breakdown/carving)

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Osteoblasts are:

• MATURE bone cells that maintain bone matrix = live in lacunae: small hole-like spaces in bone tissue

• Immature bone cells that MAKE new bone matrix & are more active in bone DEPOSITION (depositing/osteogenesis/bone formation)

• cells that can make NEW bone cells in periosteum (outside membrane of bone) & endosteum (lining inside of the medullary cavity)

• Immature bone cells that DESTROY bone by dissolving bony matrix & are more active in bone RESORPTION (breakdown/carving)

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