| Front | Lumbricals Action |
| Back | EXTEND the second through fifth fingers at the interphalangeal joints, and FLEX the second through fifth fingers at the metacarpophalangeal joint |
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| Front | Flexor Pollicis Brevis Insertion |
| Back | Base of proximal phalanx of the thumb |
| Tags |
| Front | Dorsal Interossei Action |
| Back | ABDUCT the second, third, fourth fingers at metacarpophalangeal joints, and assist to FLEX the second, third and fourth fingers at the metacarpophalangeal and extend at the interphalangeal joints |
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