Posterior compartment of the forearm Posterior compartment of the forearm The posterior compartment of the forearm (or extensor compartment) contains twelve muscles which are chiefly responsible for extension of the wrist and digits, and supination of the forearm. It is separated from the anterior compartment by the interosseous membrane between the radius and ulna. There are generally twelve muscles in the posterior compartment of the forearm, which can be further divided into a superficial, intermediate, and deep layer. Most of the muscles in the superficial and the intermediate layers share a common origin which is the outer part of the elbow, the lateral epicondyle of
Forearm (comics) Forearm (comics) Forearm (Michael McCain) is a fictional mutant villain appearing in American comic books published by Marvel Comics. As a member of the Mutant Liberation Front, Forearm has always been a mainstay on the terrorist group's roster, even staying through leader changes and incarceration. Forearm has a minor cameo appearance (nothing but his two right arms are seen, and only in one panel) as a member of the Mutant Liberation Front in "New Mutants" #86, as Rob Liefeld took over as the penciller of the series. This was immediately followed by his first full appearance in "New Mutants" #87.