Which term describes thumbs that can touch each of the four fingertips, aiding grasping?

Which term describes thumbs that can touch each of the four fingertips, aiding grasping?

• A. Opposable
• B. Prehensile
• C. Dexterous
• D. Manual

Answer: (A)

Opposable thumbs are capable of touching each fingertip, which allows a precise pinch and fine control when handling objects. This opposing movement between the thumb and fingers is what makes a strong, versatile grip possible, a hallmark feature in humans and many primates. Prehensile refers more broadly to the ability to grasp with a limb or tail, not specifically the thumb’s opposition. Dexterous describes skill and finesse in using the hands, but not the anatomical setup of the thumb. Manual just means related to the hands, without naming the gripping mechanism.

Opposable thumbs are capable of touching each fingertip, which allows a precise pinch and fine control when handling objects. This opposing movement between the thumb and fingers is what makes a strong, versatile grip possible, a hallmark feature in humans and many primates. Prehensile refers more broadly to the ability to grasp with a limb or tail, not specifically the thumb’s opposition. Dexterous describes skill and finesse in using the hands, but not the anatomical setup of the thumb. Manual just means related to the hands, without naming the gripping mechanism.