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Address for Correspondence: R.Sasikumar, Department of Anatomy, PES Institute of Medical Sciences and Research, Kuppam, Andhra Pradesh, India. E-Mail: saashikumar@gmail.com This study was carried out on 80 dry human sacra in meenakshi medical college Anatomical variations in morphology and morphometry of sacral hiatus. Various shapes of sacral hiatus were observed which included inverted U (66.3%), inverted V (11.3%), irregular (11.3%), dumbbell (3.8%) Agenesis Of the dorsal (6.3%) and bifid (1.3%). The apex of sacral hiatus was commonly found at the level of 4th sacral vertebra in 76.0%. the mean length of sacral hiatus was 22.9 mm. The mean anteroposterior diameter of sacral canal at the apex of sacral hiatus was 4.97 mm. Narrowing of sacral canal at the apex of sacral hiatus, diameter less than 4mm, was observed to be significantly high, (36%). The knowledge of anatomical variations of sacral hiatus is significant while administration of caudal epidural anaesthesia and it may help to improve its success rate.

THE STUDY ON MORPHOLOGICAL AND MORPHOMETRIC ANALYSIS OF SACRAL HIATUS IN DRY HUMAN SACRA