Updated: Dec 31 2021

Lumbrical Muscles

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                        Summary

                        Lumbricals (4 muscles)

                        Origin

    FDP tendon

                        Insertion

                        Radial lateral band of the extensor expansion (tendon)

                        Action

                        Extends PIP and DIP joint.

                        Innervation

                        1st & 2nd lumbricals: median nerve.

                        3rd & 4th lumbricals: ulnar nerve

                        Arterial supply

                        Palmar metacarpal arteries

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Lumbricals (4 muscles)
Origin	FDP tendon
Insertion	Radial lateral band of the extensor expansion (tendon)
Action	Extends PIP and DIP joint.
Innervation	1st & 2nd lumbricals: median nerve. 3rd & 4th lumbricals: ulnar nerve
Arterial supply	Palmar metacarpal arteries