Histology: Bone Flashcards Preview

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Flashcards in Histology: Bone Deck (13):
1

Diaphysis

Long shaft of bone

2

Epiphysis

Ends of the bone

3

What are osteoprogenitor cells derived from?

Mesenchyme

4

Osteoprogenitor Cells

Undergo mitosis and develop
into osteoblasts

5

Osteoblasts

Bone forming cells found on the surface of bone

6

Do osteoblasts have mitotic ability?

NO

7

Osteocytes

Mature bone cells derived from osteoblasts that do not secrete matrix but exchange nutrients and waste

8

Osteoclasts

Bone resorbing cells that work on growth, maintenance an bone repair

9

When does cartilage formation and ossification occur in the embryo?

6th Week

10

Intramembranous Ossification

- Flat bones of the skull and mandible are formed in this way
- “Soft spots” that help the fetal skull pass through the birth canal later become ossified forming the skull

11

Endochondral Ossification

- The replacement of cartilage by bone
- Most bones of the body are formed in this way including long bones

12

Appositional Growth

Growth of a bone by addition of bone tissue to its surface

13

What is the mechanism of appositional growth?

• Bone is resorbed at endosteal surface and added at periosteal surface
• Osteoblasts–add bone tissue to the external surface of the diaphysis
• Osteoclasts–remove bone from the internal surface of the diaphysis

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