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Haversian system

microscopic, structural unit of compact bone also called the osteon

Diaphysis

the main (mid) section of a long bone

Epiphyseal plate

cartilaginous area at the ends of long bones where lengthwise growth takes place in the immature skeleton (in metaphysis)

Metaphysis

growth zone between epiphysis and diaphysis during development of a long bone

Epiphysis

end of long bone

Spongy bone

Site of hemopoiesis (RBC development)

Compact bone

Holds yellow bone marrow, which contains adipose cells for fat storage

Osteocyte

mature bone cells located within lacunae. main cells in bone tissue and maintain its daily metabolism, such as the exchange of nutrients and wastes with the blood. do not undergo cell division. lower activity rates. help maintain matrix.

Osteoblast

A dividing bone-forming cell that secretes collagen and organic compounds. Form lamellae, becomes enclosed in lacuna, then differentiates into an osteocyte.

Osteoclast

A phagocytic-like bone cell that breaks down bone matrix to release calcium and phosphate into the bloodstream. Burrow tunnels called Haversian canals

Lamellae

concentric rings of bone matrix radiate out from central canal.

Haversian canal

one of a network of tubes running through compact bone that contains blood vessels and nerves

Lacuna

a small space containing an osteocyte in bone or chondrocyte in cartilage

Canaliculi

Hairlike canals that connect lacunae to each other and the central canal

Periosteum

Outer most fibrous layer that supplies blood and nerves to the bone

Synovial fluid

Lubricates, nourishes, and keeps the joint moveable

Ligaments

tissues that connect bone to bone and strengthen joints

Axial skeleton

Composed of bones that form main longitudinal axis of animal's body (rib, vertebra, skull, sternum, etc)

Appendicular skeleton

Limb or fin bones and bones that connect them to axial skeleton (Femur, radius, ulna, humerous, etc)

Joint

Where two or more bones come together

Fused joints

Not used for movement (skull)

Pivot joint

Allow rotational movement (shaking head no)

Hinge joint

Allow movement in one plane (bending of elbow)

Ball-and-socket joint

Allow movement in several planes (moving hip)

Endoskeleton

Provide support and protection, but not protect the body surface. Can protect internal organs

Exoskeleton

hard protective structure developed outside the body, as the shell of a lobster

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