People ask me some really great questions sometimes, from which really interesting conversations arise. Thank you!! Shoulder | view towards armpit with ribs muscles major nerves arteries veins (cut) and slme lymph nodes Remember anatomy 101 from high school biology “the job of the musculoskeletal system is to protect the internal organs” … so put another way ... your muscles and joints orient themselves and adapt in such a way as to minimise unhelpful mechanical strains on your vital (for life) structures (organs, brain, nerves, vessels) … never mind the limbs !!! they’ll manage.