Which of the following joints in the skull are immovable?

The correct answer indicates that all options represent immovable joints in the skull, which are known as sutures. Sutures are fibrous joints that connect the bones of the skull and provide stability while allowing for slight movements during growth and development.

The sagittal suture runs along the midline of the skull, connecting the two parietal bones. The coronal suture is found at the front of the skull, where the frontal bone meets the two parietal bones. The lambdoidal suture is located at the back of the skull, forming a joint between the occipital bone and the parietal bones.

As individuals age, the sutures can fuse, leading to fully immovable joints, which is essential for the structural integrity of the skull as it supports the brain and protects critical sensory organs. The immovable nature of these joints is vital for maintaining the shape and function of the skull throughout life.