Final answer:
The statement is false; symphysis joints allow slight movement and are classified as amphiarthroses, not synarthroses which are immobile. Symphyses provide a strong but flexible connection, unlike synarthroses that are fixed to protect internal organs.
Step-by-step explanation:
Symphysis joints, such as the pubic symphysis, consist of fibrocartilage that connects adjacent bones. This type of cartilaginous joint is designed to provide a strong connection, allowing for limited, but definitive movement under normal conditions. Unlike synarthroses, which are immobile joints providing protection for internal organs (for example, the sutures of the skull), symphyses are designed to absorb shock and allow flexibility, important in areas such as the vertebral column and the pelvic girdle. Therefore, while they do not permit the extensive movement of diarthroses, or freely movable synovial joints, they are not rigidly fixed like synarthroses.
The classification of joints by function includes three distinct categories: synarthroses (immobile), amphiarthroses (slightly movable), and diarthroses (freely movable). This helps understand the biomechanics of different areas of the body and the types of movements they can perform. For example, diarthroses facilitate a wide range of movements such as those at the shoulder or knee, whereas amphiarthroses like symphysis joints provide stability with limited mobility, which is crucial for the functioning of the pelvis during walking and childbirth.