Question

structural classification – which synovial joint type allows the greatest range of motion (e.g., shoulder, hip)?

○ a) hinge

○ b) ball-and-socket

○ c) saddle

○ d) pivot

Explanation:

To determine the synovial joint type with the greatest range of motion, we analyze each option:

• Hinge joints (e.g., elbow, knee) allow movement in one plane (flexion/extension), limiting their range.
• Ball - and - socket joints (e.g., shoulder, hip) have a rounded head (ball) fitting into a cup - like socket. This structure enables movement in multiple planes: flexion/extension, abduction/adduction, rotation, and circumduction, providing the greatest range of motion.
• Saddle joints (e.g., thumb joint) allow movement in two planes but have a more restricted range compared to ball - and - socket.
• Pivot joints (e.g., between atlas and axis) allow rotational movement around a single axis, with a limited range.

Answer:

b) Ball - and - socket