#extensor_muscle__extensor  a skeletal muscle whose contraction extends or stretches a body part
  exclusion:  #flexor_muscle
  supertype:  #skeletal_muscle  a muscle that is connected at either or both ends to a bone and so move parts of the skeleton
  subtype:  #musculus_quadriceps_femoris__quadriceps__quadriceps_femoris__quad  a muscle of the thigh that extends the leg

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