Volkov’s man at MI-6, Parsifal, has proved his worth. The schematics for Advanced Robotic Appendages and Attachment he provided two months past were revolutionary. Our science team finished a working prototype and attached it to the American without incident. With the new appendage in place, clearance was given for Department X to begin work on the Winter Soldier Project.
It has long been my plan to turn this American symbol back against our enemies. He was no aid to developing our own Super-Soldiers, but he will still be a valuable tool, in the right hands. —Captain America vol 5 #11
These metas and headcanons came about from multiple discussions with Ranee/ @wundermacher and numerous pokings around various Bucky/TWS posts/tumblrs. Please note that these are only personal headcanons/metas and aren’t set in stone, nor have to be believed, and are probably filled with plotholes and inconsistencies. Also I haven’t gotten around to reading the comics yet oops.
Synthetic Muscle I like to play with the idea that he’s got a pile of synthetic muscle attatched to his metal arm somehow possibly with hydramagic**. While the serum he was given most definately boosted his strength, stamina and a whole lot of other things, his body could possibly handle the metal arm, but I think that he might have been given synthetic muscle because the metal arm is that powerful, it’s used a hell of a lot and said synthetic muscle is probably a lot more durable compared to serum enhanced muscle. Not to mention it probably can’t be “pulled” or strained when used in excess.
Although arguably once I looked into all the muscles that control the arm (which is an absolute ton), if that was the case he’d probably end up with more extensive scarring compared to what’s seen in the movie. BUT the doctors were dealing with a giant gaping wound to work with once the remainder of his arm was removed, so I dunno?
Also I only drew the major muscles that control the arm/shoulder because there’s so many tiny ones that surround the shoulder blade and collar bone.
Metal Arm Bones Nothing too special, mainly used as an anchor, support, and to help structure the arm akin to a regular arm and it’s bones. All the intricate mechanical and technological stuff that make the arm work would be attatched to the bones.
Each bone is hollow to help lighten the arm, however each one is also made of the same/similar metal as the outer casing giving it strength.
No synthetic muscle is inside the arm.
Via some fancy mechanical movement/minor transformation his arm can dislocate and be removed for whatever purpose.
Scarring Left from a botched, early, crude method of cauterisation in attempt to seal the wound. Attempted multiple times due to cauterisation being a poor method of sealing wounds (especially way back then), hence the gnarled appearance.
Misc I also read somewhere about brain implants being used to help aid with the control in prosthetics.TWS/Bucky having an implant in his brain so he can have full control over and connection to his arm.Also Hydra doing this so his arm can be used with 100% effectiveness.
Metal arm is riddled with pressure sensors to create a sense of touch and some degree of sensetivity, however it would not be as highly tuned as skin. (Since he’s able to feel for the small grenades kept behind him on his back.) Obviously the metal arm can’t feel pain or distinguish hot and cold and so on, or he wouldn’t be doing this:
Also leads me to believe the arm can be deattatched (I know it can do this in the comic-verse but it’s unknown in the MCU). It also looks like the plates/sections near his collar bone can move or are hinged in some way? (Otherwise I don’t think he’d be able to raise his arm upwards or at all.)
Partly related but after scouring so many metal arm gifs it looks like they changed the design of his fingers at some point while filming:
Also thinking about the metal arm realistically ruins it a bit and just doesnt seem plausible, so I’m just “EH it works just cos. also hydramagic”
(**Hydramagic is an inside joke, it’s basically the equivalent of the “a wizard did it” trope)
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