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The Lumbricals Manus muscles are members of the Central Compartment Group of intrinsic muscles of the hand, composed of the:
- Adductor pollicis
- Lumbricals manus
- Palmar interossei
- Dorsal interossei manus
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.
- Flexes fingers #2-5 at the metacarpophalangeal joints.
- Extends fingers #2-5 at the proximal and distal interphalangeal joints.
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.