Flashcards in Joints, synovial fluid and cartilage Deck (12):
What are examples of fibrous joints?
What is an example of a primary cartilaginous joint?
Within a bone at the epiphysis (remember: this joint only has hyaline cartilage present in the joint)
What is an example of a secondary cartilaginous joint?
Between vertebral bodies (remember this joint has hyaline and fibrocartilage present at the joint)
What are common features of a synovial joint?
Types of synovial joints?
-Ball and socket
What layers exist in articular (hyaline) cartilage of synovial joints and what are there features?
-Superficial layer: Flattened chondrocytes, produce collagen and glycoproteins (eg lubricin)
-Transitional layer: round chondrocytes, produce proteoglycans (eg aggrecan)
->75% water (so incompressible)
Is collagen thickness the same at all articular cartilage sites?
How does synovial joint remove waste and transport nutrients if its avascular/aneural/alymphatic?
Synovial fluid produced by synovium
There are two types of synoviocytes in the synovium - A and B. What are their roles?
Type A: Remove debris, help produce synovial fluid
type B: Main synovial fluid producer
What are the functions of synovial fluid?
-Nutrition of cartilage
-Remove waste products
-Lubrication (less friction = less wear)
How does the lubrication work? (think about Boundary, hydrodynamics, weeping)
Boundary: glycoproteins such as lubricin bind to receptors on articular surfaces forming thin film
Hydrodynamic (like aquaplaning): surfaces separated by liquid pressure. Viscosity changes with load and viscosity of movement
Weeping: fluid present in cartolage squeezed into synovial cavity to inc fluid volume