What is the movement called when the thumb approaches and touches the fingertips?

• A. Extension
• B. Opposition
• C. Adduction
• D. Supination

Answer: (B)

The movement where the thumb approaches and touches the fingertips is known as opposition. This specific movement is unique to the thumb and is crucial for grasping and pinching actions, as it allows the thumb to go across the palm and make contact with the pads of the fingers. Opposition is a key component of hand function, facilitating tasks that require manipulation of objects, such as writing or holding tools. This motion is made possible by the unique saddle joint at the base of the thumb, allowing for a wide range of motion that is essential in everyday activities.