Final answer:
Syndesmoses are a type of fibrous joint that permit slight mobility and are therefore classified as amphiarthroses. These joints, such as those found between the tibia and fibula in the leg and between the radius and ulna in the forearm, allow limited movement while maintaining strength and stability.
Step-by-step explanation:
Because syndesmoses allow slight mobility, they are classified as amphiarthroses.
A syndesmosis is a type of fibrous joint between two parallel bones, united by connective tissue. In the human body, syndesmoses provide important functions. For instance, in the leg, the syndesmosis between the tibia and fibula unites these bones, allows for a limited amount of movement, and ensures the talus bone is securely positioned. In contrast, the antebrachial interosseous membrane in the forearm provides flexibility and a greater degree of movement.
Joints are functionally classified based on their degree of mobility into three main categories: synarthroses (immovable), amphiarthroses (slightly moveable), and diarthroses (freely moveable). Because syndesmoses permit a degree of movement, they fall into the category of amphiarthroses, which allow slight movement between the adjoining bones.