subdivision of skeletal system skull WikipediaCategory:Skull Wikipedia:Skull FMA:46565 skeletal system of head 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. CALOHA:TS-2344 BTO:0001295 EHDAA2:0000325 GAID:82 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 UMLS:C0037303 NCIT:C12789 MESH:D012886 SCTID:110530005 galen:Skull EMAPA:17680 UBERON:0003129 cranial skeleton in many ontologies, the structure called the cranium is inclusive of the mandible/lower jaw skeleton Anatomical structure that is part of the head consisting entirely of cranium and mandible[WP].