Musculus extensor indicis

The video tutorial provides an overview of the deep forearm extensors, focusing on the extensor indices muscle. It describes the muscle's location, origin, and insertion, as well as its innervation by the radial nerve. The tutorial also explains the muscle's role in extending the index finger and wrist, highlighting its importance in hand and finger joint movements.

What additional structure does the extensor indices muscle originate from?

Explain the movements facilitated by the extensor indices muscle.