types of bone Flashcards
long
traditonal model for bone structure
flat
internal layer of spongey sandwhiched between layer of compact
no diaphysis or epiphysis
short/irregular
compact surfaces surrounding spongy center
no diaphysis
has epiphysis and epiphsyiseal plate
small spaces usually filled with marrow
woven bone
first bone formation in ossification
weak bc collagen fibers randomly oriented
woven bone formed when
fetal development and bone repair
woven bone remodeled into
lamellar bone
lamellar bone
mature bone
collgaen fibers lay parallel to one another but adjacent to other layers
osteocytes in lacunae
spongey bone
inner layer of bone
very porous with less bone matrix
spongey bone covered by
endosteum
Trabeculae of spongy bone
interconnecting rods or plates; like scaffolding
oriented along lines of stress
between trabeculae of spongy bone is
bone marrow and blood vessels
trabeculae get nutrients by
osteocyte connections
no blood vessels penetrate
compact bone
outer layer
more solid with more matrix
compact bone gets nutrients by
blood vessels
enter bone itself
Osteon
functional unit of long bone
concentric rings of matrix around central canal (blood vessel)
central canal of osteon
runs parrallel to bones axis
lined with endosteum
has blood vessels, nerves and loose connective tissue
circumferential lamellae
outer surface of compact bone
some compact bone so thin only have circumferential lamellae and no osteon
interstial lamellae
remnants of concentric or circumferential lamellae in bone left in bone remodeling process
perferating canals of compact bone
delivery nutrients to central canal
run perpendicular of long axis of bone
contain blood vessels from periosteum or medullary cavity
