To determine which option has both amphiarthrotic and synarthrotic examples, we need to understand what these terms mean. Amphiarthrotic joints are slightly movable joints, while synarthrotic joints are immovable.
Let’s take a closer look at the options:
- a. Cartilaginous: This type of joint includes examples like the epiphyseal disk (symphysis) which can be classified as amphiarthrotic, as it allows slight movement.
- b. Fibrous: Fibrous joints include structures like sutures found in the skull, which are synarthrotic (immovable).
- c. Synovial: These joints are generally freely movable and do not typically classify as either amphiarthrotic or synarthrotic.
- d. Epiphyseal disk: This structure typically serves as an amphiarthrotic joint, allowing for some movement.
- e. Suture: Sutures of the skull are perfect examples of synarthrotic joints, as they do not permit movement.
- f. Symphysis: A symphysis is considered an amphiarthrotic joint, allowing slight movement.
From the analysis, both fibrous joints (sutures as synarthrotic) and cartilaginous joints (epiphyseal disk and symphysis as amphiarthrotic) demonstrate the required examples. Therefore, the most accurate choice that encompasses both types would be:
Answer: b. fibrous (for synarthrotic) and a. cartilaginous (for amphiarthrotic)