Joints

1. Understand the joint types:
   • Fibrous joints: Joints that don't allow any movement, typically found in the skull. Hence, it should match with III "Skull, don’t allow any movement".
   • Cartilaginous joints: These allow limited movement and are found between adjacent vertebrae. So, it should match with I "Adjacent vertebrae, limited movement".
   • Hinge joints: These permit angular movement along one plane, like the knee, which assists in locomotion. Therefore, it should match with IV "Knee, help in locomotion".
   • Ball and socket joints: These allow rotational movement, such as the joint between the humerus and pectoral girdle. Accordingly, it matches with II "Humerus and Pectoral girdle, rotational movement".
2. Arrange the matches:
   • Fibrous joints: A-III
   • Cartilaginous joints: B-I
   • Hinge joints: C-IV
   • Ball and socket joints: D-II
3. Select the correct option: The correct answer is A-III, B-I, C-IV, D-II.

A. Joint between humerus and pectoral girdle: This is the shoulder joint, which is a ball-and-socket joint, allowing for a wide range of motion. A-II

B. Knee joint: The knee joint is a hinge joint, allowing for flexion and extension. B-III

C. Joint between atlas and axis: This joint between the first two cervical vertebrae (atlas and axis) is a pivot joint, allowing for rotation of the head. C-IV