MS System - Bones Flashcards
1
Q
What is bone?
A
- Collagen fibre framework
- In a mucopolysaccharide-rich gel
- Hardened by hydroxyapatite crystals
2
Q
Epiphysis
- where
- structure
- function
A
- Top of bone
- Top = articular surface w hyaline cartilage
- Movement, stability
3
Q
Diaphysis
- where
- structure
- function
A
- Middle of bone
- Outside = compact bone, inside = hollow cylinder (bone marrow)
- Where blood vessels enter
4
Q
Metaphysis
- where
- structure
- function
A
- Between epiphysis & diaphysis
- Plates of hyaline cartilage
- Region of growth
5
Q
Cancellous (trabecular) bone
- where
- structure
- function x2
A
- Both ends
- Porous, open structure
- Supporting strength
- Site of haemopoiesis
6
Q
Cortical (compact) bone
- where
- structure
- function
A
- Outside (forms shaft)
- Solid, compact
- stiffness, strength
7
Q
Periosteum
- where
- structure
A
- Outside of diaphysis
- Compact bone
8
Q
Trabeculae
A
Laid along lines of stress:
- Allows distribution of stress
- High SA for metabolism
9
Q
Loss of trabecular due to…
A
If bones aren’t stressed –> bones remodel –> lose trabeculae
10
Q
Haversian Canals
A
Blood vessels along the LONG axis
11
Q
Volkmann’s Cannals
A
Blood vessels along the PERPENDICULAR axis
12
Q
Lamellae
- what
- where
A
- Concentric circles around vessels
- Mainly in cortical bone
13
Q
Lamellae & osteocytes
A
Most cells are in v close contact to blood vessels, BUT osteocytes aren’t –> finger-like projections
14
Q
Cancellous bone & lamellae
- SO?
A
- Less lamellar layers
SO - Less dense & coordinated –> weaker
15
Q
Bone matrix components x3
A
- Collagen (organised arrangement)
- Hydroxyapatite
- Water
