The modern human anatomy is characterized by the need to study the variant anatomy of various structures, including fossil osteological materials. From the point of view of modern craniology, the issue of individual anatomical variability of the skull in combination with the characteristics of the size, shape, position and relationship of the various parts in its structure is relevant, since the structure of the skull bones differs in the expressed individual variability of different characteristics, such as inconstant bones of the skull. The purpose of the work was to study the variant anatomy of inconstant bones of the human skull on the anthropological materials from the grave field of IX-XIII century near the Nitsakha village (Ukraine). Material and methods. The research was carried out on 44 skulls of adults which are currently stored in the osteological collection of the Department of Human Anatomy of the V. N. Karazin Kharkiv National University. Results and discussion. The sutural bones were presented in structure of 12 skulls (27,3%), the fontanel bones were presented in 7 skulls (15,9%). Insular bones were not present in the studied material. Inconstant bones are often placed in several sutures at once or were combined with a fontanel bones. The most common among the sutural bones were the bones of the lambdoid suture. It was represented in 8 skulls (18.2%). The lambdoid suture contained from 1 to 5 bones. Multiple bones (10-17) were present in 2 skulls (4,5%). The bones of the sagittal suture were present in 4 skulls (9.1%). In all cases, these were single relatively large bones of elongated or irregular shape up to 32 mm in size. In all cases, these were single bones of elongated or irregular shape. Coronal suture bones were present in 3 skulls (6.8%). The bone located in the parieto-mastoid suture was present on 1 skull (2.3%). Inconstant bones of the squamosal suture were not found. Among fontanel bones the most common were the bones of the occipital fontanel (5 skulls, 11,4%). The bones of the frontal fontanel were present on 1 skull. It was an extra bone of quite large size (17×28 mm). The bones of the mastoid fontanel were found on 2 skulls (4.5%). The bones of the sphenoid fontanel, as well as the interosseous bones, were not represented on the osteological material studied. Conclusion. The research allowed to study variant anatomy and individual features of the inconstant bones of the skull on anthropological materials from grave field (IX-XIII centuries) near the Nitsakha village (Ukraine). The results showed that inconstant bones of the skull were a common variant of the skull anatomy among the studied osteological materials.
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