Which muscle group is responsible for the abduction of the 2nd and 4th fingers at the MP joint?

The dorsal interossei muscles are primarily responsible for the abduction of the 2nd and 4th fingers at the metacarpophalangeal (MP) joints. These muscles are located between the metacarpal bones and play a crucial role in the movement of the fingers. Specifically, the first dorsal interosseous muscle abducts the 2nd finger away from the midline of the hand (which is typically the 3rd finger), while the second dorsal interosseous muscle performs a similar function for the 4th finger.

This abduction is essential for various tasks, including grasping and manipulating objects, allowing for a better hand function and dexterity. The innervation of these muscles comes from the ulnar nerve, which is significant for their coordinated movement.

Other muscle groups listed do not contribute to the abduction of the 2nd and 4th fingers specifically at the MP joint. The flexor digitorum muscles primarily flex the fingers and do not produce abduction. Palmar interossei assist with adduction of the fingers towards the midline and are therefore not involved in abduction. Lumbricals facilitate flexion at the MP joints while extending the proximal and distal interphalange