Flashcards in chap 3 part 2 Deck (46)
Which layer of articular cartilage is primarily densely packed collagen II?
Which layer of articular cartilage is a thin crystalline mineral plate that functions in sealing the cartilage from bone?
deep layer (by bone)
Which layer of articular cartilage is composed of chondrocytes arranged in columns?
What is the outer layer (continuous with the periosteum) of the joint capsule composed of?
fibrous dense CT
Which layer of the joint capsule contains a rich blood, lymph, and nerve supply, regenerates if damaged and is not considered an epithelial lining?
synovial layer or synovial membrane
What are the two cell types associated with the synovial layer?
Type A synovocytes and type B synovoctyes
What makes up synovial fluid?
high concentration of hyaluronan and lubricin
What are the 3 types of synovial membranes?
fibrous synovium, areolar synovium, and adipose synovium
Which type of synovial membrane has Type A and B cells and extends into the joint cavity as synovial folds and villi?
T/F: adipose synovium contains Type A cells.
False; Type B cells
Which is slower and more common, appositional or interstitial cartilage growth?
appositional cartilage growth occurs much slower and is more common
Where does appositional growth originate?
T/F: new chondroblasts can develop from fibroblasts in the fibrous perichondrium?
Where does new chondrogenic perichondrium develop from?
the previous fibrous perichondrium
Where does new fibrous perichondrium develop from?
the surrounding CT
What are the 2 main functions of appositional cartilage growth?
enlarging existing cartilage and healing
What type of cartilage has more chondrocytes, less matrix, and elastic fibers?
How does elastic cartilage function?
provides more flexibility; not to stretch like a rubber band
What type of cartilage is composed of chondrocytes, fibrocytes, and collagen I fibers?
T/F: fibrocartilage has no perichondrium and is avascular.
True (with exception of a few vessels in peripheral knee menisci)
What are the 2 main functions of fibrocartilage?
provides strength (against stretch/tensile forces) and shock absorption (resists compressive forces)
What is the major limitation of fibrocartilage?
no appositional healing because there is no perichondrium
During development of fibrocartilage, tissue is initally more like what?
dense regular CT with fibroblasts
During development of fibrocartilage, the pressure from accumulating molecules changes the fibroblasts into what?
During development of fibrocartilage, what type of cells/fibers develop following compressive forces?
hyaline matrix (collagen II fibers and GAGs)
If developing fibrocartilage experiences more shearing/pulling forces, what type of cells/fibers develop
T/F: no fibroblasts remain as fibrocytes.
False; some do
What type of cartilage is a combination of dense regular CT and hyaline cartilage?
What happens to chondrocyte numbers with aging? what happens to matrix with aging? calcification of cartilage?
decrease, decrease, and increase