Chapter 6: bone formation/ossification

Question 1

How many forms of bone formation/ossification is there?

Answer 1

there are two types that start at about week 9 of development

Question 2

What is intramembranous ossification?

Answer 2

bones formed from membrane; mainly flat bones of the skull.

Question 3

Step 1 of intramembranous ossification

Answer 3

Question 4

Step 2 of intramembranous ossification

Answer 4

Question 5

step 3 of intramembranous ossification

Answer 5

Question 6

Step 4 of intramembranous ossification

Answer 6

Question 7

What is endochondral ossification?

Answer 7

bones formed from hyaline cartilage. most bones are formed by this type of ossification

Question 8

What is the first step in endochondral ossification?

Answer 8

the bone collar forms and blood vessels grow from perichondrium into cartilage

Question 9

What is the second step in endochondral ossification?

Answer 9

cartilage in center of the diaphysis calcifies; cavities develop where cartilage deteriorates

Question 10

What is the third step in endochondral ossification?

Answer 10

blood vessels of periosteal bud go into cavities and spongy bone forms

Question 11

What is the fourth step in endochondral ossification?

Answer 11

medullary cavity forms and ossification centers develop in epiphyses

Question 12

What is the fifth step in endochondral ossification?

Answer 12

epiphyseal plates form between epiphyses and diaphysis

resting zone - cartilage resting from growing

proliferation zone - cartilage is growing; bone is growing in length at both ends

epiphyseal line - where epiphyseal plate ossifies and bone becomes more dense.