Lumbricals Manus

Joe Muscolino

Share This

The lumbricals manus intrinsic muscles of the hand. The flexor digitorum profundus and adductor pollicis have been ghosted in.

The Lumbricals Manus muscles are members of the Central Compartment Group of intrinsic muscles of the hand, composed of the:


There are four Lumbricals Manus muscles, named #1, #2, #3, and #4, from radial/lateral (thumb side) to ulnar/medial (little finger side).



  • The lumbricals manus attach from the distal tendons of the flexor digitorum profundus to the distal tendons of the extensor digitorum.
    • The lumbricals manus attach into the tendons going to fingers #2-5 (index, middle, ring, little)
    • Each lumbrical manus attaches into the radial side of its respective finger.
    • The distal tendons of the extensor digitorum form the dorsal digital expansion.




NOTE: Lumbricals manus can also abduct/adduct fingers #2-5. They abduct the index finger, radially abduct the middle finger, and adduct the ring and little fingers.