RESUMEN
Background: Asterion is the point of sutural confluence present on the norma lateralis of the skull. Occasionally sutural bones are present at asterion. Asterion is commonly used as a surgical landmark for the lateral approach of the cranial fossa. So, the knowledge on the incidence of the presence of sutural bones at the asterion is important for surgeons. Thus the present study was undertaken to find out the incidence of the occurrence of the sutural bones present at the asterion. Subjects and Methods:70 skulls were collected from the department osteology section.The damaged bones were excluded from the study. A total of 140 asterions were studied. All the skulls were observed and the incidence of type 1 and type 2 asterion was recorded on both sides. The incidence of the multiple sutural bones was also recorded on both the right and left sides. Results: The incidence of type 2 asterion was observed to be higher than the type 1 asterion. The incidence of type 1 and type 2 sutural bones was observed as 27.86% and 72.14% respectively. The incidence of the multiple sutural bones at the asterion was observed as 14.29%. Conclusion: The data on the incidence of occurrence of sutural bones which was presented in the present study may be of great use to the radiologists and neurosurgeons for a better diagnosis and to minimize the complications while performing lateral approaches of the cranial fossa.
RESUMEN
Background and objective: Studies of non-meteric cranial variants have been a field of considerable interest to research workers specially because of their racial and regional importance. Supernumerary ossicles (or Wormian bones) of the cranial vault are formations associated with insufficient rate of suture closure. It was reported that there exists racial variability among the incidence of these bones. Material and methods: Studies of fifty north Indian skulls of Rohilkhand Medical College Bareilly and Shri Ram MurtiSmarak Institute of Medical Sciences, Bareilly, U.P. were studied for the incidence of Bregmatic bone cranial variant. Results: In our study the incidence of bregmatic bone was 4%, which was higher than reported elsewhere. Conclusion: The findings are discussed in the light of available literature and are of considerable racial and regional significance. We believe that the knowledge of bregmatic bone is of importance to the neuroanatomists, neurosurgeons, radiologists, anthropologists, paediatricians and morphologists.
RESUMEN
Inadequate ossification of the interparietal region induces the appearance of interparietal and wormian bones, also associated with genetic factors. The formation of the interparietal bone depends on the separation of the intermediate segment from the lateral plate by the transverse occipital suture, which means that this bone is formed by the medial and lateral plates. Wormian interparietal bones or epactal bones are located within the interparietal region, being single or multiple, and are located in the upper central region of the interparietal region, the sutural bones, however, are formed from additional ossification centers that can occur in near sutures. The aim of this work was to macroscopically evaluated the presence of changes in the structure of the adult human occipital bone in cadavers found in the human anatomy laboratory of the Goißs Federal University in order to determine the frequency of supernumerary bones associated with occipital and parietal bones and relate it to literature, as well as to provide images and data for ethnic studies in the Brazilian population and data that could help medical practices such as fetal position and radiographs. Our data have indicated that the frequency of the interparietal bone of 1.92 percent is among those seen in countries such as Japan, Bulgaria, Nigeria, India and Turkey, but lower than values found in pre-Hispanics Chileans; however, for the sutural bones, the frequency of this study was higher than other data obtained from Spanish and other Brazilians.
La osificación inadecuada de la región interparietal induce a la aparición de los huesos interparietal y wormiano, asociado también con factores genéticos. La formación del hueso interparietal depende de la separación del segmento intermedio desde la placa lateral por la sutura occipital transversal, lo que significa que este hueso se forma por las placas medial y lateral. Los huesos interparietales wormianos o hueso epactal se encuentram dentro de la región interparietal, siendo únicos o múltiples, y se localizan en la región central superior de la zona interparietal. Los huesos suturales, sin embargo, se forman de centros de osificación adicionales que pueden aparece cerca de estas suturas. El objetivo de este trabajo, fue evaluar macroscópicamente la presencia de variaciones en la estructura del hueso occipital en cadáveres humanos, adultos encontrados en el Laboratorio de Anatomía Humana de la Universidad Federal de Goiás, con la finalidad de determinar la frecuencia de los huesos supernumerarios asociados con los huesos parietal y occipital. Además, comparamos estos datos con los descritos enla literatura y, aportamos imágenes y datos para estudios étnicos en la población Brasileña. Estos datos pueden ayudar en las prácticas médicas como la posición fetal y radiografías. Nuestros datos indicaron que la frecuencia del hueso interparietal fue de 1,92 por ciento y se encuentra en países como Japón, Bulgaria, Nigeria, India y Turquía, pero inferior a los valores encontrados en chilenos prehispánicos. Sin embargo, para los huesos suturales, la frecuencia de este estudio fue superior a otros datos obtenidos de españoles y otros estudios realizados en individuos brasileños.