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Skeletal System

Chapter 4

diaphysis shaft part of the long bone
medullary cavity hollow tube running down the middle of the diaphysis, filled with yellow marrow and is used for shock absorption
periosteum thin membrane covering the diaphysis where the tendons and ligaments attach
epiphyses ends of the long bones, made of spongey bone which is filled with red bone marrow
articular cartilage covering the epiphyses, a smooth surface that assist in joint function
metaphysis the growth plate, between the diaphysis and the epiphysis
bone matrix consist of: calcium phosphate 92/3 of the weight) and calcium hydroxide and collagen fibers
lamellae layer of bone matrix
osteocytes bone cells, live in a pocket called lacuna, maintain and monitor the protein and mineral content of the matrix and can assist in the repair of bone
osteoblasts "bone builder" produce bone matrix, process called osteogenesis
Osteoprogenitor cells stem cells which divide to maintain the population of osteoblasts--important in healing fractures
Osteoclasts "bone destroyers" descendants of monocytes (white blood cells) remove bone matrix by dissolving with acids and enzymes this reabsorption process is called OSTEOLYSIS
ossification bone formation
calcification depositing of calcium in body tissues
endochondral ossification formation of long bones
intramembranous ossification formation of flat bones (skull & mandible)
bone remodeling constant breaking down and re-making of bones to ensure strength and durability
Created by: michellerolfs