What type of joints are described as being immovable?

Synarthroses are described as immovable joints. This classification of joints is characterized by the absence of a joint cavity and is primarily found in areas where strength and stability are required. Examples of synarthroses include the sutures in the skull, where the bones are tightly bound together, providing structural integrity to protect the brain.

Diarthroses refers to freely movable joints that allow a wide range of motion, such as the knee and elbow. Amphiarthroses are joints that allow limited movement, providing some flexibility while still maintaining stability, like the joints between the vertebrae. Articulated joints is a broader term that encompasses all types of joints and does not specifically refer to immovable joints. Therefore, the correct answer refers specifically to those joints that do not permit any movement, making synarthroses the accurate choice.