NETA Personal Trainer Practice Exam

Which type of joint is characterized as immovable?

1. Amphiarthrodial

2. Synarthrodial

3. Diathrodial

4. Cartilaginous

The correct answer is: Synarthrodial

The type of joint characterized as immovable is synarthrodial. Synarthrodial joints are defined by their lack of movement, as they are tightly bound by fibrous connective tissue or cartilage, allowing little to no motion between the bony surfaces. This immobility is essential in areas where stability is crucial, such as the sutures of the skull, where the bones are fused to protect the brain. In contrast, amphiarthrodial joints allow for slight movement, providing a combination of stability and flexibility. Diarthrodial joints, also known as synovial joints, are highly mobile and allow for a wide range of motion, making them important for many physical activities. Cartilaginous joints, while providing some degree of flexibility, do not fit the definition of immovable, as they typically permit limited movement. Understanding these distinctions helps emphasize why the synarthrodial joint is specifically referred to as immovable, underlining its role in providing structural integrity in the body.