Increasing the length of a bone

zone of calcification (blood vessels)

-blood vessels from diaphysis grow into area -tissues near blood vessels contain Osteoblasts -osteoblasts deposit new matrix on calcified cartilage and grow through appositional bone growth

Zone of Hypertrophy

-chondrocytes from proliferation MATURE and ENLARGE -cells furthest from epiphysis are older and larger

zone of Resting Cartilage

-contains randomly arranged, SLOW dividing Chondrocytes (cartilage cells) -nearest to epiphysis

zone of Proliferation

-produces new cartilage -chondrocytes divide and form columns resembling STACKS of coins

zone of Calcification

-very thin and contains hypertrophied chondrocytes and calcified cartilage - hypertrophy chondrocytes DIE

Increase in bone length contains what two things?

1) Formation of new cartilage 2) appositional bone growth

What four zones make up the epiphyseal plate? (From closest to epiphysis to closest to diaphysis)

1) zone of Resting Cartilage 2) zone of Proliferation 3) zone of Hypertrophy 4) zone of Calcification

Long bones and bony projections increase in length because of growth from where?

The epiphyseal plate

Between 12- 15 years of age what happens in terms of bone growth?

Ossification catches up with epiphyseal plate and it becomes the epiphyseal line (bone STOPS growing in LENGTH)