page_title: Lumbricals of the hand
section_title: Structure
hierarchical_section_title: Lumbricals of the hand / Structure
caption_attribution_description: English: Based off: Based off:
context_page_description: The lumbricals are intrinsic muscles of the hand that flex the metacarpophalangeal joints and extend the interphalangeal joints.
  The lumbrical muscles of the foot also have a similar action, though they are of less clinical concern.
context_section_description: The lumbricals are four, small, worm-like muscles on each hand. These muscles are unusual in that they do not attach to bone. Instead, they attach proximally to the tendons of flexor digitorum profundus and distally to the extensor expansions.
caption: Lumbricals labeled at bottom left. Left hand, palmar view.
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