Upper Limb.10 - Back of the forearm - Genral disscusion

The muscles of the back of the forearm has a common origin which is the front of the lateral epicondyle and they go backward and can be divided into three groups. The first group is the muscles that goes into the back of the wrist and extends it. At the medial side there is the extensor carpi ulnaris that extends to the fifth of the metatarsal bone. As there is an extensor carpi ulnaris, then there is must be an extensor carpi radialis which there are two of them, one lateral that goes to the base of the second metacarpus, and it's called the extensor carpi radialis longus and it's called longus because it arises just from above the common origin. It arises from the lower part of the supracondylar redge of the humerus. Medial to it and coming from the common origin is the extensor carpi radialis brevis that is inserted into the third metacarpal. Between the extensor carpi radialis and the extensor carpi ulnaris, there will be the extensor of the digits of the medial four fingers and is represented mainly by this muscle which has a common origin from the front of the lateral epicondyle and it goes down to divide into four tendons for the four digits this is the extensor digitorum muscle that is inserted into the back and distal distal phalanges of the four fingers. Medial to the extensor digitorum longus and supporting it extending the little finger, there will be the extensor digiti minimi. Also to the deep of the tendon of the index there is another tendon coming from of the back of the ulnar. This tendon is for the extensor indicis