Question

7 identify the types of structural and functional joints numbered (7, 8, 9) in these illustrations by categorizing the labels to the correct location. (some labels will be used more than once: some labels will not be used.) ball - and - socket condylar saddle synovial amphiarthrosis diarthrosis synarthrosis classifications structural 7 functional 7 structural 8 functional 8 structural 9 functional 9

Explanation:

• Structural joints are classified based on the material binding the bones and the presence or absence of a cavity. Synovial joints have a synovial cavity.
• Functional joints are classified based on the amount of movement they allow. Diarthrosis joints are freely movable.
• For joint 7 (metacarpophalangeal joint): It is a condylar joint structurally (synovial joint type where an oval - shaped condyle fits into an elliptical cavity). Functionally, it is diarthrosis (freely movable).
• For joint 8 (trapeziometacarpal joint of the thumb): It is a saddle joint structurally (each bone surface is saddle - shaped). Functionally, it is diarthrosis.
• For joint 9 (hip joint): It is a ball - and - socket joint structurally (a ball - shaped head fits into a socket - like cavity). Functionally, it is diarthrosis.

Answer:

Structural 7: Condylar, Functional 7: Diarthrosis, Structural 8: Saddle, Functional 8: Diarthrosis, Structural 9: Ball - and - socket, Functional 9: Diarthrosis