Sutural bones can have different asymmetrical shapes: oval, round, triangular, oblong, quadrilateral and polygonal and can vary from under 1mm in diameter to 5 x 9cms. 9 Knowledge of this variation is very important for neurosurgeons, radiologists and anthropologists among others. 7, 8 The rest occur in any remaining sutures and fontanels. ![]() The second most common site of incidence (about 25%) is in the coronal suture. Approximately half of Sutural bones are located in the lambdoid suture and fontanel and the masto-occipital suture. They are found in both sexes as well as in both sides of the skull. 1 It is controversial whether the development of Sutural bones is influenced by genetic or external factors. Sutural bones articulate with the surrounding bones by sutures with indentations more complex on the outer surface of the human skull than on the inner aspect. Sutural bones are supernumerary small bones sporadically found in the course of cranial sutures and fontanels or isolated. 6 The aim of this paper is to do a mini review about Anatomical Classification of Sutural bones. The international anatomical nomenclature named Sutural bones as Ossa Suturalia and identified them as A02.1.00.043. Sutural bones were also mentioned but with other names by Paracelsus 5 and D'Andemach Gonthier, but Vesalius was one of the first to associate Sutural bones with cerebral disorders. ![]() 4 But their first description was attributed to Hippocrates. He made a detailed description of them in 1643. Sutural bones were named Wormian bones after the Danish anatomist, Olaus Wormius, a medical doctor at the University of Copenhagen. Sutural bones are studied and reported as ethnic variables, being of interest to human anatomy, physical anthropology, forensic medicine, radiology among others. Many factors have been proven to be involved in the incidence of Sutural bones in the human skull but it remains controversial what affects the prevalence of Sutural bones formation and the mechanisms responsible for the formation of Sutural bones are unknown and it is still unclear why Sutural bones are common in certain races. The presence of Sutural bones may mislead the diagnosis when X-rays are taken and they may be mistaken for fractures. 1, 2 They are poorly described although they are quiet frequent. Sutural bones result from formation of abnormal ossification centers in the skulls that develop in addition to those seen normally. They are supernumerary irregular, accessory and abnormal small bones interposed between cranial bones, most commonly located in the lambdoid suture. Sutural bones are sporadically found in the course of cranial sutures and fontanels or isolated. ![]() The human skull is composed of several bones that fuse together after birth additionally to the regular centre of ossification of the skull.
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