muscels are a part of the body
myocardium is internal_body_part. myocardium is not body_part. hypothalamus is body_part. musculature is not body_part. musculature is not internal_body_part. myocardium is body_part. amniotic_sac is body_part. musculature is internal_body_part. musculature is body_part. musculoskeletal_system is body_part.