Flashcards in Joints and Joint tissue Deck (20):
Two types of Synarthroses (fibrous)
1) Synostosis - may fuse (skull suture)
2) Syndesmosis - unfused (interosseous)
What predominately makes up synarthroses
What type of joint is a synchondroses, and what types are there?
Cartilagenous. There are primary or secondary
eg) epiphyseal plates (small amount of movement)
eg) costocartilage (for ventilation)
eg) intervertebral disc
vertebrae-hyaline cartilage-NP and AF- hyaline cart-vertebrae
eg) manubriosternal joint
Whats in NP
hyaluronon, sulphate and PG
Whys it hard to pull apart two vertebral bodies?
Due to the annulus fibrosus. It has collagen fibres that extend into the cartilage and some even down into bone (sharpeys fibres)
There is a ____________ between NP and AF
How do we shrink over a day?
NP is sandwhiched between two cartilage plates. These squeeze down on NP and water (bound to hyaluronan) is squeezed out/ lost, and the tissue collapses a little. Collectively over all the vertebrae, you loss a few mm, that is regained at night.
where is the COG in the different regions
Cervical= right over NP
thoracic= posterior as there is more ant tissue
lumber= both COG and NP are posterior
What is the danger in the lumbar region?
As both COG and NP are posterior, this becomes a weak point. The AF can stiffen and break, and allow the soft NP to leak out and impinge a nerve root
What's a diarthroses
A synovial joint
what are menisci and what can happen to them
Wedges of fibrocartilage that improve the articulation. very thin centrally, these can tear and jam into the joint
examples of diarthroses
1) temporomandibular joint
Whats in synovial fluid?
hyaluronan (binds water and low coefficients of friction)
Where do you find synovium?
Where are you most likely to develop degenerative artritis?
In the periphery of your joints where the PG content is lower.
Ways to prevent degenerative arthritis
By using your joints IN THE FULL RANGE OF MOTION
What can happen when you get bone on bone
Your bone tries to disperse the force, and creates 'osteophytes'/bony spurs.