Final answer:
The term 'cartilaginous' is not a functional classification for joints, but a structural one. Functional classifications are synarthroses, amphiarthroses, and diarthroses.
Step-by-step explanation:
The option that is NOT a functional classification for joints is cartilaginous. Cartilaginous is a structural classification, not a functional one. The functional classification of joints divides them into three categories: synarthroses (immovable joint), amphiarthroses (slightly movable joint), and diarthroses (freely movable joint). Synarthroses include joints like sutures, gomphoses, and synchondroses. Amphiarthroses include joints such as syndesmoses and symphyses. Lastly, diarthroses encompass all synovial joints, which are characterized by a synovial cavity that allows free movement.