1 Flashcards
periosteum
membrane around the bone
bone covering
Diaphysis
Shaft of a long bone
epiphysis
end of long bone (proximal & distal )
marrow cavity
red make blood cell and yellow marrow store fats
endosteum
Thin membrane lining marrow cavity
Compact bone
hard dense outer region
allow bone to resist stresses ( pressure , twisting compression)
spongy bone
found inside cortical bone
resist forces from many directions
Trabeculae
epiphysis like
End of long bone:
epiphyseal plate
still growing
they are hyaline cartilage that are found in developing bone in children.
what is the structure of flat bones, irregular and sesamoid?
Covered by periosteum
Diploë-2 outerr layer of thin compact bone with middle layer spongy bone
Sinuses -air fill spaces
What do sinuses do?
They reduced bone weight
BONE CELLS EXPLAINED
osteogenic-Differentiate into osteoblast ( make cell so they can b build )
osteoblast-bone deposition(building bone)
Osteocyte -mature bone cells and Lacunae(basically every other cells what to do they don’t do nothing)
osteoclasts- bone resorption (remodel bone, brake bones down)
Where do process ossification begin
begin in embryonic period & continue through adulthood
endochrondral ossification
A formed all bones below head except clavicle(flat bone)
begin as hyaline cartilage
end at age 7
calcitonin
causes decrease calcium level
stop osteoclasts from break bone
increase the calcium lost in urine
