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

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

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

Answer: (C)

Recognizing joints by where they sit along the finger helps you map labels to anatomy. The distal interphalangeal joint is the joint between the middle and distal phalanges and sits closest to the fingertip. On the index finger, this is the joint near the tip. If Structure K is located there, it identifies the distal interphalangeal joint of the index finger. The other joints shown in the choices are in different locations: the base joint at the thumb (carpometacarpal), the mid-finger joint farther from the tip (proximal interphalangeal), and the knuckle at the hand-finger junction (metacarpophalangeal). So Structure K corresponds to the distal interphalangeal joint of the index finger.

Recognizing joints by where they sit along the finger helps you map labels to anatomy. The distal interphalangeal joint is the joint between the middle and distal phalanges and sits closest to the fingertip. On the index finger, this is the joint near the tip. If Structure K is located there, it identifies the distal interphalangeal joint of the index finger. The other joints shown in the choices are in different locations: the base joint at the thumb (carpometacarpal), the mid-finger joint farther from the tip (proximal interphalangeal), and the knuckle at the hand-finger junction (metacarpophalangeal). So Structure K corresponds to the distal interphalangeal joint of the index finger.