In the hand anatomy, Structure K corresponds to which joint in the set?

In the hand anatomy, Structure K corresponds to which joint in the set?

• A. Second proximal interphalangeal joint
• B. First carpometacarpal joint
• C. Second distal interphalangeal joint
• D. Second metacarpophalangeal joint

Answer: (C)

Understanding where finger joints sit helps map diagram labels to actual anatomy. Structure K is at the region between the middle phalanx and the distal phalanx of the index finger. That location marks the distal interphalangeal joint of the second digit, the joint closest to the fingertip on the index finger. This differs from the other joints: the first carpometacarpal joint is at the base of the thumb, not near the fingertip; the second proximal interphalangeal joint lies between the proximal and middle phalanges and is located a bit farther from the tip; the second metacarpophalangeal joint is where the index finger meets the metacarpal bone at the hand’s base.

Understanding where finger joints sit helps map diagram labels to actual anatomy. Structure K is at the region between the middle phalanx and the distal phalanx of the index finger. That location marks the distal interphalangeal joint of the second digit, the joint closest to the fingertip on the index finger.

This differs from the other joints: the first carpometacarpal joint is at the base of the thumb, not near the fingertip; the second proximal interphalangeal joint lies between the proximal and middle phalanges and is located a bit farther from the tip; the second metacarpophalangeal joint is where the index finger meets the metacarpal bone at the hand’s base.