Lecture 3 Flashcards
How much of the bones strtucture is organic (collagen etc.)
33%
How muchg of the bones structure is inorganic (hydroxyappitite)
67%
What is the funtion of collagen
Gives bones flexibility, resists tension
What is the function of inorganic structure, (hydroxyappitite, minerals)
Makes bones rigid, resists compression
What are the 4 different types of bone cells
Osteocytes, osteogenic cells, osteoblasts, osteoclasts
Function of osteogenic cells
Produce new bone cells
Function of osteocytes
Communicate with other osetocytes to maintain bone
Function of osteoclasts and osteoblasts
Osteoclasts break down bone, osteoblasts build bone
What do osteons house
Blood vessels, nerves, lymphatics
4 parts of osteon structure
Lamellae, central canal, canaliculi, lacunae
What is the function of canaliculi
Allows for nutrient exchange and communication bvetween osteocytes
What is the function of lacunae
Spaces that house the osteocytes
What is lamellae
Cylinders formed of ECM
What is the function of lamellae
Collagen fibres in the lamallae withstand forces
What are trebeculae
Struts of lamella bone that house lacunae for osteocytes and canaliculi
What is endochondral ossification
Turning cartillage into bone
Where does primary ossification occur
Diaphysis (shaft)
Where does secondary ossification occur
Epiphysis (bone ends)
What seperates the epiphysis and diaphysis
Epiphyseal plate (growth plate)
What is endochondral ossification
Bone growth in length
What is appositional growth
Bone growth in thickness
