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Flashcards in Skeletal system Deck (23)
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1

What is the skeletal system composed of?

Cartilage, bone tissue, epithelial tissue, nerve, blood forming tissue, adipose tissue, and dense regular tissue

2

What are the 6 functions of bone?

Structure, support, blood cell formation, storage of minerals, protection, and movement

3

A typical long bone has what 3 major sections

1. Epiphysis- end
2. Metaphysis- just below epiphysis
3. Diaphysis- middle

4

What kind of tissue is bone

Connective tissue

5

What are the 4 main types of bone cells

1. Osteogenic cells (the ones that undergo mitosis)
2. Osteoblast (loses ability to divide and gains ability to form matrix)
3. Osteocyte (mature cell contained in hard matrix)
4. Osteoclast (large cells formed by WBC to aid in bone growth, maintain, repair, and remodel)

6

Osteogenic cells

Young cells that undergo mitosis or become osteoblasts
- located beneath endosteum and periosteum

7

Osteoblasts

Form from osteogenic cells that lose there ability to divide and gain the ability to produce matrix
- located beneath endosteum and periosteum

8

Osteocytes

Mature bone cell that become surrounded by matrix and incased in lucunae
- located beneath endosteum and periosteum

9

Osteoclasts

(clean up) Formed from fused monocytes (WBC)
- located beneath endosteum and periosteum
- Secrete enzyme that dissolve bone matrix
- function in bone growth, maintenance, repair, remodelling

10

What is bone matrix made up of?

15% water
30% organic matrix (collagen fibres)
55% inorganic matrix (minerals & salts)

11

Mineralization is AKA

Calcification

12

Calcification is..

Hardening of tissue when mineral crystals deposit around collagen fibres

13

What 3 main components are in the bone matrix?

- Spaces for red bone marrow and vessels
- spongy bone that has many spaces
- compact bone that has vey few spaces

14

One way to classify bone

density; compact or spongy (cancellous) bone

15

Describe compact bone

- solid hard layer of bone
- makes up the shaft of long bone and external layers of all bones
- resist stresses from weight and movement
- composed of osteons

16

Osteons

the chief structural unit of compact (cortical) bone, consisting of concentric bone layers called lamellae, which surround a long hollow passageway, the Haversian canal

17

Haversian system

- concentric rings of calcified matrix surrounding a haversion canal

18

Haversian Canal

Any of the tiny, interconnecting, longitudinal channels in bone tissue through which blood vessels, nerve fibers, and lymphatics pass.

19

What connects haversian canals together in compact bone?

Volkman's Canal

20

Volkman's canal

connects haversian canals together in the compact bone

21

In spongy bone there is...

- latticework of thin plates of bone called trabeculae oriented along lines of stress
- the space between trabeculae is filled with red bone marrow
- found in ends of long bones and flat bones

22

What types of bone contain red bone marrow?

-flat bones (cranial, pelvic, ribs, and sternum)
- proximal humerus and femur

23

Whats another word for bone formation

ossification