part of part of has part has part head subdivision of skeletal system cranium skull A skull that is missing a mandible is only a cranium; this is the source of a very commonly made error in terminology. Those animals having skulls are called craniates Anatomical structure that is part of the head consisting entirely of cranium and mandible[WP]. BTO:0001295 CALOHA:TS-2344 EHDAA2:0000325 EMAPA:17680 FMA:46565 GAID:82 MESH:D012886 OpenCyc:Mx4rvVjOsZwpEbGdrcN5Y29ycA UBERON:0003129 UMLS:C0037303 WikipediaCategory:Skull cranial skeleton galen:Skull in FMA the skull is divided into orbit, neurocranium (8 parts), viscerocranium (26 parts). Here we have a separate overlapping division into cranium and mandible. in many ontologies, the structure called the cranium is inclusive of the mandible/lower jaw skeleton skeletal system of head uberon skeleton of lower jaw structure with developmental contribution from neural crest cranial skeletal system