Which two joints are immovable?

Which two joints are immovable?

• A. Skull and pelvis
• B. Neck and spine
• C. Shoulders and hips
• D. Ankles and wrists

Answer: (A)

Immovable joints are fibrous joints that provide stability with little to no movement. The joints between the bones of the skull are sutures, which knit the skull bones tightly together and practically do not move after early development. The pelvis is also built for stability; its main connections—the sacroiliac joints and the pubic symphysis—allow only tiny, limited movement in adults. In contrast, the neck and spine have many movable joints, the shoulders and hips are ball-and-socket joints with wide ranges of motion, and the ankles and wrists are also highly mobile. So the skull and pelvis are the two immovable joints.

Immovable joints are fibrous joints that provide stability with little to no movement. The joints between the bones of the skull are sutures, which knit the skull bones tightly together and practically do not move after early development. The pelvis is also built for stability; its main connections—the sacroiliac joints and the pubic symphysis—allow only tiny, limited movement in adults. In contrast, the neck and spine have many movable joints, the shoulders and hips are ball-and-socket joints with wide ranges of motion, and the ankles and wrists are also highly mobile. So the skull and pelvis are the two immovable joints.