has part has part has_part only in taxon only_in_taxon develops_from develops from anatomical entity Vertebrata <vertebrates> subdivision of skeletal system cartilage tissue cartilaginous neurocranium in contrast to chondrocranium, this structure is entirely cartiliginous. In Chondricthyes this is the same as the neurocranium. FMA:76621 is an undefined fetal structure, so we assume the correct placement is here. Note that this is distinct from MA:0000317 which is the uberon:neurocranium (the part of the cranium that encloses the brain) embryonic chondocranium UBERON:0004761 uberon NCIT:C34121 The primitive cartilagionous skeletal structure of the fetal skull that grows to envelop the rapidly growing embyonic brain. In humans, the chondrocranium begins forming at 28 days from mesenchymal condensations and is fully formed between week 7 and 9 of fetal development. While the majority of the chondrocranium is succeeded by the bony skull in most higher vertebrates, some components do persist into adulthood.[1] In Cartilagious fishes and Agnathans, the chondrocranium persist throughout life.[2] Embryologically, the chondrocranium represent the basal cranial structure, and lay the base for the formation of the endocranium in higher vertebrates[WP]. Wikipedia:Chondrocranium cartilaginous skull UMLS:C1516496 SCTID:155540009 chondocranium AAO:0000094 neurocranium XAO:0003059 cartiligionous skeletal structure of skull FMA:76621 cartilaginous chondocranium AAO:0010153 EHDAA:6031 head paraxial mesoderm