Abstract
Introduction: The distal dural ring (DDR) is a well-studied anatomic structure of significant neurosurgical relevance, defined as the point of entry of the internal carotid artery (ICA) into the subarachnoid space. The relationships between the DDR and the surrounding structures have been the subject of some controversy, including debate over whether the ICA can safely be separated from the DDR. These relationships have been subject to multiple gross anatomic investigations, but the only preceding histologic study did not specifically evaluate the relationship between the ICA and the DDR.
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