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Extensor Indicis Muscle – Origins & Function – Human Anatomy | Kenhub

Extensor Indicis Muscle – Origins & Function – Human Anatomy | Kenhub


Well, hello, everyone! It’s Matt from Kenhub,
and in this tutorial, we will be discussing the extensor indicis muscle. The deep extensors
of the forearm consist of five muscles located at the posterior side of the forearm. Their
muscle bellies and tendons form the surface of the distal forearm and the wrist where
they can be easily palpated. The focus of this video will be one of these muscles called
the extensor indicis. This muscle runs parallel to the extensor pollicis longus on its medial
side. The extensor indicis muscle originates at
the posterior side of the ulna and the interosseus membrane near the wrist. The extensor indicis
inserts at the dorsal aponeurosis of the index finger. Like all extensors of the forearm,
these five muscles are innervated by the radial nerve which is seen here highlighted in green
in this image. The radial nerve divides into a superficial branch and deep branch at the
height of the radial head. The deep branch penetrates the supinator muscle and branches
off as the posterior interosseus nerve which supplies the extensor indicis. The main function of the deep extensors is
to move the joints of the hand and fingers. The extensor indicis pulls the index finger
by performing extension at the metacarpophalangeal, proximal interphalangeal, and distal interphalangeal
joints. This leads to an extension of the wrist joint as well. This video is more fun than reading a textbook,
right? If you want more videos, interactive quizzes, articles, and an atlas of human anatomy,
click on the “Take me to Kenhub” button. It is time to say goodbye to your old textbooks
and say hello to your new anatomy learning partner, Kenhub! See you there! https://www.kenhub.com

2 Replies to “Extensor Indicis Muscle – Origins & Function – Human Anatomy | Kenhub”

  • Hi guys! Was this fun or what? Let us know in the comments what you enjoyed about this video. But wait! You're not done yet. There is still a lot you can do to learn this topic. Check out our quizzes, related articles and atlas sections on the deep extensors of the forearm: https://khub.me/9w11t Happy studying!

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