Skeletal System/Bones

Question 1

Endochondral Ossification step 1

Answer 1

Chondrocytes at the center of of the growing cartilage model enlarge and then die as the matrix calcifies.

Question 2

Endochondral Ossification step 2

Answer 2

Newly derived osteoblasts cover the shaft of the cartilage in a thin layer of bone.

Question 3

Endochondral Ossification step 3

Answer 3

Blood vessels penetrate the cartilage. New osteoblasts form a primary ossification center.

Question 4

Endochondral Ossification step 4

Answer 4

The bone of the shaft thickens and the cartilage near each epiphysis is replaced by shafts of bone.

Question 5

Endochondral Ossification step 5

Answer 5

Blood vessels invade the epiphyses and osteoblasts from secondary centers of ossification. (fully formed bone @ this stage)

Question 6

Endochondral Ossification

Answer 6

Hyaline cartilage model replaced by bone

Most bones formed this way

Question 7

Intramembranous Ossification

Answer 7

Bone develops from s fibrous connective tissue membrane

Forms flat bones of skull, mandible, clavicle, sternum

Question 8

Osteoblasts

Answer 8

Bone forming cells

Question 9

Osteoclasts

Answer 9

Bone destroying cells

Question 10

Osteoprogenitor cells

Answer 10

Precursors to osteoblasts

Question 11

Osteocytes

Answer 11

Mature bone cells (osteoblasts) trapped in lacuna between lamellae