human_reference_atlas has part bone cell Homo sapiens subdivision of skeletal system neurocranium EHDAA2:0000243 braincase XAO:0003170 neurocranial The cartilaginous parts of the neurocranium undergo endochondral ossification in most species; ossification has been lost in cartilaginous fishes, but the cartilaginous condition of the skull of lampreys is considered to be primitive (Kardong, 1995)[PMID:11523816]. The neurocranium arises from paraxial mesoderm in the head (first five somites and the unsegmented somitomeres rostral to the first somite) and from ectoderm via the neural crest. In Chondrichthyes and other cartilaginous vertebrates this portion of the cranium does not ossify; it is not replaced via endochondral ossification[WP]. ZFA:0001580 Wikipedia:Neuroranium EMAPA:17681 It includes the following bones: Ethmoid bone, Frontal bone, Occipital bone, Parietal bone, Sphenoid bone, Temporal bone. The term cranium can be ambiguous, in that it can refer to the neurocranium, or the neurocranium and the Facial skeleton TAO:0001580 uberon FMA:53672 SCTID:361731002 brain case neurocranium MA:0000317 AS AAO:0010153 Anatomical cluster that consists of the cartilages and bones that surround the brain.[TAO] Subdivision of skeletal system that surrounds and protects the brain. Includes the skull base, sensory capsules and the central part of the skull roof. brain pan It seems MA uses 'neurocranium' as a synonym for chondrocranium. Note there are currently some structures part of both viscero and neurocranium - ethmoid, zyogomatic, ... neurocranium brain box UBERON:0001703 cranial bone