Histology of the distal dural ring

Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists
Christopher S GraffeoMichael J Link

Abstract

The distal dural ring (DDR) is a conserved intracranial anatomic structure marking the boundary point at which the internal carotid artery (ICA) exits the cavernous sinus (CS) and enters the subarachnoid space. Although the CS has been well described in a range of anatomic studies, to our knowledge no prior study has analyzed the histologic relationship between the ICA and DDR. Correspondingly, our objective was to assess the relationship of the DDR to the ICA and determine whether the DDR can be dissected from the ICA and thus divided, or can only be circumferentially trimmed around the artery. The authors examined ten fresh-frozen, adult cadaveric specimens. A standard frontotemporal craniotomy, orbito-optic osteotomy, and extradural anterior clinoidectomy was performed bilaterally. The cavernous ICA, DDR, and supraclinoid ICA were harvested as an en bloc specimen. Specimens formalin-fixed and paraffin-embedded prior to routine histochemical staining with hematoxylin and eosin and Masson trichrome. In all specimens, marked microscopic investment of the DDR throughout the ICA adventitia was noted. Dural collagen fibers extensively permeated the arterial layers superficial to the muscularis propria, with no evidence of a clear ...Continue Reading

References

May 25, 1999·Acta Neurochirurgica. Supplement·M T Lawton, R F Spetzler
Dec 15, 2004·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·Frederic Collignon, Michael Link
May 2, 2006·Skull Base : Official Journal of North American Skull Base Society ... [et Al.]·Federica BerettaJeffrey T Keller
Oct 1, 1995·Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia·S KobayashiH Okudera
Aug 22, 2008·Neurosurgery·Alexandre YasudaGuilherme C Ribas

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