Lec 16 - Osteon model & Ossification

Question 1

Whats the nam of each ring on a osteon?

Answer 1

Concentric lamellae

Question 2

What does the central canal contains?

Answer 2

Blood vessels & nerve (Haversian system)

Question 3

Lacunae

Answer 3

cavities, house osteocytes

Question 4

Canaliculi

Answer 4

connects lacunae

Question 5

Whats the remaining of resorbed osteons called?

Answer 5

Interstitial lamellae

Question 6

Name the rings inside the periosteum

Answer 6

Circumferential lamellae

Question 7

What connects ajacent ‘central canals’ of osteons?

Answer 7

Volkmann’s canals

Question 8

What forms the porous structure of spongy bone?

Answer 8

Trabeculae (branching ribs)

Question 9

Trabeculae are covered by_____?

Answer 9

Endosteum

Question 10

Function of spongy bone

Answer 10

• Resistance
• Propective framework for bone marrow

Question 11

T/F
Spongy bone have osteons/central canals?

Answer 11

FALSE
(It does not)

Question 12

List the structures that spongy bone does have

Answer 12

• Concentric lamellae
• Canaliculi
• Lacunae
• Osteocytes

Question 13

whats the name of the first formed bone?

Answer 13

Primary bone
(irregular collagen bundles)

Question 14

T/F
The primary bone has many osteocytes & little inorganic matrix?

Answer 14

TRUE

Question 15

Primary bones develope into__________?

Answer 15

Secondary (Lamellar bone)
(regular arranged collagen bundles)

Question 16

List the bundles for each bone class

Answer 16

Primary - Iregular collagen bundles
Secondary - Regular arranged collagen bundles

Question 17

T/F
Secondary bone has more inorganic matrix than primary bones

Answer 17

TRUE

Question 18

Name the 2 types of ossification

Answer 18

1. Intramembranous
2. Endochondral

Question 19

Intramembranous ossification location & origins

Answer 19

Location: Flat bone of skull, Clavicle

Origins: Mesenchymal membrane (embryonic connective tissue)

Question 20

T/F
inna spongy bone forms before compact bone at primary ossification center?

Answer 20

TRUE

Question 21

Endochondral begins as____?

Answer 21

Cartilage

Question 22

What bones are formed by Endochondral ossification?
(Bones location)

Answer 22

All bones below the skull
(except clavicle)

Question 23

Which type of cartilage does Endochondral ossication start from?

Answer 23

Hyaline cartilage

Question 24

Name the properties that the hyaline cartilage of (endochondral ossification) is consist of?

Answer 24

-Chondrocytes
-Cartilage ECM
-Perichondrium, with -chondroblast

Question 25

NOTE

Answer 25

Pericondreum - Osteoblast
Perichondrium - Chondroblasts

Question 26

Where is the locatin of ‘secondary ossification center’?

Answer 26

Epiphyses

Question 27

Where is the location of ‘primary ossification center’

Answer 27

Shaft (Diaphysis)

Question 28

What occurs in the primary ossification center

Answer 28

Osteoblast replace cartilage with spongy bone