2. C. Types of movement 1. Flexion decreases the angle between bones 2. Extension increases the angle between bones, often to restore a body part to its anatomical position after flexion 3. Hyperextension is a continuous extension beyond the anatomical position

3. 4. In rotation, a bone moves in a single plane around its longitudinal position 5. In circumduction, the distal end of a body part moves in a circle 6. Abduction usually refers to movement of a bone away from bodies midline 7. Adduction usually refers to movement of a bone toward bodies midline

4. D. Types of Diarthroses 1. In gliding, or arthrodial, joints, articulating surfaces are flat and movement is either back and forth or side to side 2. A hinge, or ginglymus, joint contains the convex surface of one bone fitting into a concave surface of another bone

7. 3. In a pivot, AKA trachoid, joint, a round or pointed surface of one bone fits into a ring formed by another bone and ligaments; rotation is rotational and monoaxial 4. In an ellipsoidal (condylloid) joint, an oval shaped condyle of one bone fits into an elliptical cavity of another bone. movements are flexion extension, abduction adduction, and circumduction

10. 5. A saddle (sellaris) joint contains one bone whose articular surface is saddle shaped and another bone whose articular surface is shaped like a rider on a saddle. Movements are flexion extension, abduction adduction, and circumduction 6. In a ball and socket, or spheroid joint, the ball shaped surface of one bone fits into the cup-shaped depression of another. Movements are flexion extension, abduction adduction, rotation, and circumduction