Which of the following contains fixed joints?

Joints are the points at which two or more bones connect and allow movement.

Fixed joints are joints in the human skeleton that have little or no movement and are typically held together by strong, fibrous connective tissue, such as ligaments.

The cranium is the bony structure that forms the head and protects the brain. It is also known as the skull. The cranium has sutures, which are fixed joints. The sutures connect the cranial bones, which are fibrous joints that allow limited movement and help absorb shock but do not allow for significant movement. The sutures in the skull ensure proper skull development and growth during infancy and childhood.

Hence, the correct answer is cranium.