query: SELECT ?item ?itemdesc ?class ?classdesc
  WHERE
  {
    ?item wdt:P31 wd:Q103997018. # ?item is instance of direct anatomical metaclass
    OPTIONAL { ?item wdt:P8225 ?class. } # ?item is metaclass for ?class
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". ?class schema:description ?classdesc . ?item schema:description ?itemdesc }
  }
  ORDER BY ?item