Lesson 5: Bone Formation

Question 1

Process by which bone is formed

Answer 1

Ossification

Question 2

Two Patterns of Ossification

Answer 2

Intramembranous Ossification
Endochondral Ossification

Question 3

 “intra” – within membrane
 Formation of bone directly on or within loose fibrous connective tissue
membranes
 Form directly from mesenchyme without first going through a cartilage
stage

Answer 3

Intramembranous Ossification
 E.g. Fontanels – “little fountains”

Question 4

 “chondro” – cartilage
 Formation of bone within hyaline cartilage
 Mesenchyme is transformed into CHONDROBLASTS which produce a
hyaline cartilage matrix that is gradually replaced by bone

Answer 4

Endochondral Ossification

Question 5

 type of dense connective tissue that can withstand considerable tension
 semi-opaque and has no nerve nor blood supply of its own
 cells also located in the lacunae
 no canals, no Haversian system, avascular
 oxygen and nutrients reach the cells by diffusion from the capillaries in the fibrous
covering of the cartilage

Answer 5

Cartilage

Question 6

Type of Cartilage;
most common, glossy

Answer 6

Hyaline Cartilage

Question 7

Type of Cartilage;
strongest, serves as cushion to some joints with limited motion

Answer 7

Fibrous Cartilage

Question 8

Type of Cartilage;
with elastic fibers/ some which has some firmness

Answer 8

Elastic Cartilage