2. Describe two factors that affect joint stability. 3. For each of the following exercises, name two joints involved and one type of movement that occurs at each joint. a. Chin-ups: b. Squats: 4. People are sometimes described as being "double-jointed." What does this actually mean? 17 B. Concept Mapping 1. Fill in the blanks to complete this concept map outlining the relationship of articular surface shape to the action that occurs at a joint. flexion hinge hyperextension plane glenohumeral SYNOVIAL JOINTS Movements allowed Types Examples Talocrural Decreases angle between two articulating bones Intertarsal Continuation of extension Ball-and-socket beyond anatomical position 2. Construct a unit concept map to show the relationships among the following set of terms. Include all of the terms in your diagram. Your instructor may choose to assign additional terms. acetabulum pubofemoral ligament articular cartilage extension fovea capitis meniscus periosteum synovial fluid tibial collateral ligament atlantoaxial