Which functional classification term defines an immovable joint?

Which functional classification term defines an immovable joint?

• A. Diarthrotic
• B. Amphiarthrotic
• C. Synarthrosis
• D. Synarthrotic

Answer: (D)

Mobility of joints is categorized into three functional groups. An immovable joint is described with the term synarthrotic, which conveys the joint's lack of movement. The related noun synarthrosis names the joint type itself, but when the question asks for the term that defines the immovable nature, the adjective synarthrotic is the precise descriptor. For contrast, diarthrotic means freely movable, and amphiarthrotic means slightly movable. A skull suture is a classic example of a synarthrotic (immovable) joint because the bones are tightly interlocked and movement is not allowed.

Mobility of joints is categorized into three functional groups. An immovable joint is described with the term synarthrotic, which conveys the joint's lack of movement. The related noun synarthrosis names the joint type itself, but when the question asks for the term that defines the immovable nature, the adjective synarthrotic is the precise descriptor. For contrast, diarthrotic means freely movable, and amphiarthrotic means slightly movable. A skull suture is a classic example of a synarthrotic (immovable) joint because the bones are tightly interlocked and movement is not allowed.