The interesting question is less about pectorals, than more broadly about the bony structure of the shoulder assemblage and the rotator cuff. Honestly, considering that I teach anatomy, and how common are folks with extra arms in various fantastic literature and mythology, I'm kind of surprised I haven't thought about this is more depth before - the biomechanics of the shoulder are a right bitch - basically, you have a very flat ball and socket joint (which itself is mobile) that allows an unusually wide range of movement, supported by a highly tuned but relatively fragile musculature. (Anyone out their had a rotator cuff injury? I'm sure you'd agree...) Does she have extra scapulae? Are they one on top of each other, like plate mail or something? How is the shoulder assemblage mounted vis a vis her rib cage? Then you get to figure out all the muscle attachment points...
(Yes, in fact, my next position is designing biologically inspired robots, but I'm mostly working with invertebrates so this is pretty far outside of my purview. Still, entertaining, no?)
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timeasmymeasure
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Date: 2018-05-28 02:44 pm (UTC)(Yes, in fact, my next position is designing biologically inspired robots, but I'm mostly working with invertebrates so this is pretty far outside of my purview. Still, entertaining, no?)