part of part_of part of part_of has part has_part has part develops_from develops from surrounds surrounds occipital bone EMAPA:25112 FMA:52735 GAID:227 MA:0001468 MESH:D009777 NCIT:C12757 OpenCyc:Mx4rwQtsiZwpEbGdrcN5Y29ycA UBERON:0001676 UMLS:C0028784 formed from the sclerotome of the occipital somites. It is not present in living or fossil agnathans or cartilaginous fishes, but appears to have arisen in parallel in many bony fishes. Incorporation of the occipital ver- tebrae into the skull was associated with the annexation of the upper part of the spinal cord into the brain, together with the first 2 spinal nerves as cranial nerves XI and XII fusion of basi-, exo- and supra-occipitals (and maybe tabular) occipital complex occipital squama os occipitale the bone at the lower, posterior part of the skull uberon chondrocranium sclerotome dermatocranium foramen magnum occipital region flat bone neurocranium bone