bone Flashcards
Definition of Bone
connective tissue characterized by a mineralized ECM
What is the ECM of bone
hydroxyapatite crystals
type 1 collagen
small amt of type 5
glycoproteins (ostecalcin,nectin and pontin)
Cells of BONE
osteocyte
osteoblast
osteoprogenitor cells
osteoclast
What is the function of bone
support
protection
storage site for calcium and phosphate
Endosteum
covers the inner surface of the marrow cavity and contains osteoprogenitor and endosteal cells that become osteocytes
Components of bone
bone tissue hemopoietic tissue fat tissue dense connective tissue vessels and nerves endosteum
examples of long bones
diaphysis, epiphysis, metaphysis, tibia and metacarpals
examples of short bones
carpal bones
examples of flat bones
skull cap and sternum
examples of irregular bones
complex shape like vertabra
haversian lamellae
concentrical lamellae surrounding a haversian canal that forms cylindrical units called osteon; haversian canals contain vessels and nerves
lacunae are between the lamellae with osteocytes
canaliculi penetrate lamellae with osteocytic processes
interstitial lamellae
between osteon space filled with old haversian systems (remodling bone)
outer circumferential lamellae
lining the outersurface of the bone under the periosteum
inner circumferential lamellae
lining the inner surface of the bone under the endosteum
Where is immature bone found
developing fetus, alveolar sockets, tendon attachments