Bone Flashcards
External coating of the bone
Periosteum
Internal coating in the bone
Endosteum
Long middle section of bone
Diaphysis
Type of bone that’s rigid and load bearing
Compact / cortex
Ends of long bones
Epiphyses
Inside hollow space of long bones
Medullary cavity
Surface of bones that meet other tissues
Articulating surface
Type of bone in the ends of long bones
Cancellous / trabecular
Transition between diaphysis and epiphysis
Metaphysis
Deposits of ___ in matrix
Calcium phosphate
Osteocytes live in ___
Lacunae
Exchange nutrients and form pathways for blood
Canaliculi
Osteon diameter
200 microns
Functional unit of compact bone
Osteon
Original cells
Osteoprogenitor
Break down bone matrix
Osteoclasts
Build bone matrix
Osteoblasts
Supervisor cells
Osteocytes
Rings of osteons
Lamellae
Unmineralized bone matrix
Osteoid
ECM is 70% ___
Hydroxyapatite
Compact bone turnover
5% per year
Spongy / cancellous bone turnover
25% per year
Channel running through the center of the osteon
Haversian canal
Rings in trabecular bone
Lamellae
What does compact bone has that spongy doesn’t
Haversian canal
Osteon is surrounded by ___
Cement line (weakest point)
Properties depend on loading direction
Anisotropic
Stress-strain depend on time and temp
Viscoelastic
Tension vs. compression gives a different result
Asymmetry
Bone is strongest in ___ loading
Compression - tension - shear
Bone is stiffer and stronger at
Higher strain rates
Wolff’s law
Form follows function, unused tissue degrades
___ differentiate into osteoblasts
Mesenchymal stem cells
Degradation of tissue around an implant
Stress shielding