Question

Which of the following digits contain only 2 phalanges?
5
2
3
1

Answer 1

Only the thumb, which is digit number 1, contains two phalanges. The index finger to the little finger, digits 2 through 5, have three phalanges each.

Step-by-step explanation:

Each finger and thumb on the human hand contains phalanx bones, also known as phalanges. These bones are essential for the structure and movement of the hand. The thumb, which is digit number 1, contains only two phalanges: a proximal phalanx and a distal phalanx. The other digits, labeled 2 through 5 (the index finger to the little finger), each have three phalanges: proximal, middle, and distal. Thus, when examining which digits contain only two phalanges, we can determine that only the thumb, or digit number 1, meets this criterion. The hand has 14 phalanges bones, which are the bones of the fingers and thumb. The thumb has two phalanges, a proximal and a distal phalanx. The remaining digits (fingers) each have three phalanges - a proximal, middle, and distal phalanx. Therefore, the digits that contain only two phalanges are digits 2 (index finger) through 5 (little finger).