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Lumbricals (Hand)
Region: Forearm & Hand Muscles · All forearm & hand muscles
Lumbricals (Hand) at a glance
| Origin | Tendons of flexor digitorum profundus in the palm |
|---|---|
| Insertion | Extensor expansions of the four fingers (radial side) |
| Actions | Bend the fingers at the knuckles while straightening the middle and tip joints — the 'intrinsic plus' position |
| Nerve supply | Median nerve (1st–2nd) and ulnar nerve deep branch (3rd–4th), C8–T1 |
◆ Good to know
Uniquely, they arise from the tendons of another muscle and link the flexor and extensor systems — central to fine finger coordination.
More Forearm & Hand Muscles
Please note: This page is an anatomy education summary for students and curious readers, not medical advice. Attachment points are given in their classic short form; individual anatomy varies, and detailed dissection-level descriptions belong in an anatomy atlas.