<Tr> <Th> FMA </Th> <Td> 59327 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terms of bone (edit on Wikidata) </Td> </Tr> <P> Wormian bones, also known as intra sutural bones, are extra bone pieces that occur within a suture (joint) in the cranium . These are irregular isolated bones that appear in addition to the usual centers of ossification of the cranium and, although unusual, are not rare . They occur most frequently in the course of the lambdoid suture, which is more tortuous than other sutures . They are also occasionally seen within the sagittal and coronal sutures . A large wormian bone at lambda is often called an Inca bone (Os Incae), due to the relatively high frequency of occurrence in Peruvian mummies . Another specific wormian bone, the pterion ossicle, sometimes exists between the sphenoidal angle of the parietal bone and the great wing of the sphenoid bone . They tend to vary in size and can be found on either side of the skull . Usually, not more than several are found in a single individual, but more than one hundred have been found in the skull of a hydrocephalic adult . </P> <P> Wormian bones are a marker for some diseases and important in the primary diagnosis of brittle bone disease: osteogenesis imperfecta . </P>

What is an example of a sutural bone