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Literature

Extra arms: anatomy study

Recently, I've been playing with 3D models of bones. Here I want to explore three possible configurations for the bones of a human body with 4 arms (+ a bonus with 6 arms at the end). Each configuration has its own description, discussing the advantages/disadvantages in terms of functionality/mobility and aesthetics. Of course, there are many alternative ways the extra arms could be implemented. In my case, I begin with the normal human skeleton as a base and I try to see how the extra arms could be integrated with as few changes as possible to the skeleton, because I want them to resemble more to normal humans. For example, I want to avoid stuff like an elongated torso to accommodate the new arms, or extra clavicles to support arms, etc... In my configurations, I focus all the changes on the scapula (the flat shoulder bone), which is enough to accommodate the extra arms. I consider only the bones though, without accounting for the muscles (discussed briefly at the end), ligaments