![](http://www.alamy.com/thumbs/6/F8DC9A3D-1EE5-452F-A9D0-57411BDF09A7/2WJG7KK.jpg)
The lumbricals are deep muscles of the hand that flex the metacarpophalangeal joints .
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Photo credit: © medicapic / Alamy / Afripics
License: Royalty Free
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