Foramen rotundum is a circular aperture present in the base of the skull in the sphenoid bone, it connects the middle cranial cavity and the pterygopalatine fossa. Sometimes there may be a variation in several skulls that leads to the formation of the bony canal near the Foramen rotundum.Anatomical awareness of such variation in the middle cranial cavity fossa are important.The main aim of this study is to observe the presence or absence of accessory bony canal around foramen rotundum.32 unsexed dry cranial cavity from the Department of Anatomy,Saveetha Dental College was observed for the presence of accessory bony canal near foramen rotundum in the middle cranial cavity.The observed data was tabulated and analysed.14 accessory bony canal was observed near the Foramen rotundum in the total of 32 Skulls. Hence the occurrence was found to be 21.87%.In this study 9 accessory bony canals were observed on the left side with a percentage of 14.06% and the rest 5 was observed on the right side with a percentage of 7.81%. There is no incidence of bilateral accessory bony canal.Our study of the morphometric analysis of accessory bony canal near foramen rotundum may create an awareness for such variations in the middle cranial cavity and the orbital regions
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