Chapter 5 Skeletal System Reverse Flashcards
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bones
joints
cartilages
ligaments
Skeletal system
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Axial skeleton
appendicular skeleton
skeletal subdivisions
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206
bone in an adult
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support the body protect soft organs allow movement due to attached muscle store minerals and fats blood cell formation
function of bones
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compact bone outside osteon spongy bone-inside
bone tissue
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Long bones
short bones
flat bones
irregular bones
classification of bone shape
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typically longer than wide expanded end femur, humerus
long bones
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generally cube shaped carpals and tarsals
short bones
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thin flattened and usually curved skull, ribs and sternum
flat bones
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irregular shape do not fit other classification categories vertebrae, hip bones
irregular bones
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Diaphysis
epiphysis
periosteum
perforating fibers
articular cartilage
epiphyseal plate e
piphyseal line
medujllary cavity
long bone structure
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shaft wall thick layer of compact bone covering spngy bone
diaphysis
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expanded joints forms joints spngy bone covered by compact bone
epiphysis
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outside covering of the diaphysis blood vessels just underneath fibrous connective tissue membrane
periosteum
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secure periosteum to the underlying bone
perforating fibers
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covers external surface of epiphysis located on articulated surface made of hyaline cartilage decreases friction at joint surfaces
articular cartilage
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flat plate of hyaline cartilage seen in young growing bone
epipyseal plate
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remnant of epiphyseal plate seen in adult bones
epiphyseal line
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cavity inside diaphysis lined by endosteum contains yellow marrow in adults contains red marrow in infants highly vascular
medullary cavity
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osteon central canal lamellae lacunae nutrient foramen perforating canal canaliculi
microscopic anatomy of bone
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funtional unit of compact bone containing central canal and matrix rings
osteon
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opening in the center of an osteon carries blood vessels and nerves
central canal
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rings around the central canal
lamellae
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cavities containing osteocytes between lamellae
lacunae
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on surface of bone where blood vessels enter and leave
nutrient foramen
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canal perpendicular to the central canal carries blood vessels and nerves
perforating canal
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tiny canals radiate from central canal to lacunae form transparent system connecting all bone cells to nutrient supply
canaliculi
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ossification intramembranous ossification endochondral ossification bone growth appositional growth
Bone formation
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bone formation calicification of bone
ossification
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begins as fibrous sheet produces flat bones
intramembranous ossification
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bone develops from hyaline cartilage model six weeks fetal development to early 20s most bones develop this way
endochondral ossification
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epiphyseal plates allow for longitudinal growth of long bones during childhood new cartilage is continuously formed older cartilage becomes ossified epiphyseal plate ossifys then growth stops
bone growth
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process by which bones grow in diameter
appositional growth
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process of reabsorption and depostion that occurs throughout life 3-5percent annually
bone remodeling
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blood calcium level pull of gravity and muscles on the skeleton
remodeling factors
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osteoclasts secure substances that break down calcified extracellular matrix Acids dissolve inorganic components Lysosomal enzymes digest organic components Osteoblasts secrete new bone
cells involved in remodeling
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osteocyte mature bone cells osteoblast bone forming cells osteoclasts bone destroying cells
types of bone cells
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forms longitudinal axis of the body support head neck and trunk 3 parts
Axial skeleton
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Skull and hyoid vertebral column ribs and sternum
parts of axial skeleton