Everyday Muscle.

Extensor Digitorum Brevis Manus

Hand
A rare accessory hand muscle that can appear as a dorsal hand mass — often mistaken for a ganglion cyst or tumor by patients and physicians alike.
Function
May assist extension of index or middle finger
Origin
Dorsal wrist capsule/carpal region, often near distal radius/carpus
Insertion
Extensor expansion/tendon of index or middle finger, variable
Innervation
Posterior interosseous nerve (radial nerve), usually
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Flexor Digitorum Profundus Extensor Digitorum Extensor Indicis Flexor Pollicis Longus Extensor Pollicis Longus Extensor Pollicis Brevis Abductor Pollicis Longus Adductor Pollicis Opponens Pollicis Opponens Digiti Minimi (Hand)