Joint Types and Movements in Forelimb

Steps:

• Identify the shoulder joint as a ball-and-socket type, which connects the humerus to the scapula.
• Recognize that ball-and-socket joints permit multi-directional movement in three planes: sagittal, frontal, and transverse.
• Contrast with the elbow, a hinge joint allowing only flexion and extension in one plane.
• Match options to anatomical facts for the forelimb's shoulder.

Why C is correct:

• The shoulder is a ball-and-socket joint by definition, enabling rotation and movement in three planes due to the spherical head fitting into a cup-like socket.

Why the others are wrong:

• A: Elbow is a hinge, not ball-and-socket, and allows one-plane movement.
• B: Shoulder is ball-and-socket, not ball-hinge; hinge restricts to one plane.
• D: Shoulder is ball-and-socket, not hinge, and allows three-plane movement.

Final answer: C