![](http://www.alamy.com/thumbs/6/AFB20B92-7EB2-48C8-B73B-877FFD7A33CC/2WJG56C.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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