摘要：The anterior fontanel is the largest of the fetal fontanels and is usually closed by the end of the first or second year. Notwithstanding, it is not uncommon for the fontanel to contain a separate ossicle, which may be present at birth or develop later. This fontanel bone or so-called bregmatic bone appears to grow centrifugally until it fuses in variable sequence with the centripetally growing edges of the parietal and frontal bones during the fourth or fifth year of life. In some cases the anterior fontanel bone does not fuse with the adjacent bones and it is presented in adults as a separated supernumerary bone. Therefore, the aim of the study was to establish and compare the incidences of the anterior fontanel bone amongst three cranial series of adult individuals from Bulgaria – a contemporary male and medieval male and female series. Our results showed that this anatomical variation was presented with very low frequency only in the male series and completely absent in the female one
关键词：anterior fontanel bone; anatomical variation; cranial series
