According to the textbook:

• Cartilaginous joints (A) join bones with the help of cartilages, such as the joint between the adjacent vertebrae in the vertebral column (II) .
• Ball and socket joints (B) are a type of synovial joint found between the humerus and pectoral girdle (IV) .
• Fibrous joints (C) do not allow movement and are found between flat skull bones which fuse end-to-end to form the cranium (I) .
• Saddle joints (D) are found between the carpal and metacarpal of the thumb (III) .