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Interossei and Lumbricals (Intrinsic Group)
Region: Forearm & Hand Muscles · All forearm & hand muscles
Interossei and Lumbricals (Intrinsic Group) at a glance
| Origin | Metacarpals and the deep flexor tendons within the hand |
|---|---|
| Insertion | Extensor expansions of the fingers |
| Actions | Fine control of finger posture — bend at the knuckle, straighten beyond it |
| Nerve supply | Mainly ulnar nerve deep branch; lateral lumbricals median (C8–T1) |
◆ Good to know
Loss of these intrinsics produces the claw hand posture; their combined action is tested by asking the patient to hold a card between straight fingers.
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.