Abstract

BACKGROUND: Assimilation is congenital fusion of atlas vertebra with the base of occipital bone; it may be partial or complete fusion. It is the most common anomaly found at the cranio-vertebral junction. This anomaly results due to failure in segmentation and separation of lower occipital sclerotome and 1st cervical sclerotome during development of fetus. MATERIAL METHODS: study was conducted on 30 dry skull bone collected from department of our college and observed for the assimilation of atlas vertebra. RESULTS: Assimilation of atlas vertebra was observed in 2 skull bones and details of these are described in following article. CONCLUSION: The knowledge of this osseous anomaly is important for neurosurgeons, orthopedician, anesthetists and radiologists.

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