What Is The Extensor Muscle That Branches To Form Four Tendons On The Back Of The Hand?

What Is The Extensor Muscle That Branches To Form Four Tendons On The Back Of The Hand? As it courses the dorsum of the hand, the extensor digitorum communis muscle spreads out into four (4) flat tendons deep to the extensor retinaculum to the medial four fingers. What is the extensor muscle? Extensor muscle, any