Flashcards in Day 4 Deck (15):
What are the four consistent features of synovial (diarthrosis) joints?
articular or fibrous capsule, synovial membrane, articular cartilage and synovial fluid
What are the characteristics of the type I articular receptors?
located in the superficial layer of the fibrous capsule, resemble Ruffini endings, most numerous in cervical zygapophyses and they monitor the joint "at rest"
What are the characteristics of type II articular receptors?
located in deeper strata of the fibrous capsule, resemble Pacinian corpucles, most numerous in the cervical spine and monitor the joint during normal range of motion
What are the characteristics of type III articular receptors?
preset in collateral and intrinsic ligaments, resemble Golgi tendon organs, not initially observed along the vertebra column and monitor extreme joint motion
What is the function of type IV articular receptors?
nociceptive, they monitor pain
Type IVb articular receptors would be present in what locations?
accessory ligaments in general, dense in the posterior longitudinal ligament of the spine
What are the three modifications of articular synovial membrane?
(1) synovial villi, (2) articular fat pads or Haversian glands, (3) synovial menisci and intra-articular discs
What is the generic function of modifications of articular synovial membrane?
aid in spreading synovial fluid
What are the specific functions of type A synovial cells?
What is the specific function of type B synovial cells?
secrete proteinaceous substances and hyaluronic acid
What is the common function of type A and type B synovial cells?
formation and absorption of synovial fluid
What are examples of glycosaminoglycans important in articular cartilage?
hyaluronic acid, chondroitin sulfates and keratin sulfate
What is the primary function of bound glycosaminoglycans in articular cartilage?
form a network for water retention
What is implied when cartilage is said to have elastic properties?
cartilage can deform and returns to original volume rapidly, a time independent property