A Guide to Temporal Bone Dissection: Labyrinthectomy (Part 4 of 6)

Authors

Mohamedkazim M. Alwani, MD1, 3

Jon L. Harper, BS1, 3

Rick F. Nelson, MD PhD1, 2, 3

Author Affiliations

Department of Otolaryngology – Head and Neck Surgery1

Department of Neurological Surgery2

Indiana University School of Medicine3

Video Description

This video demonstrates the key steps of a labyrinthectomy during lab dissection of the temporal bone. The goal of this video is to serve as a supplementary teaching resource for resident-level surgical trainees by demonstrating key surgical landmarks and proper lab dissection technique. This video builds on part three of our video series and demonstrates fundamental steps involved in a labyrinthectomy including: the identification of the three-dimensional (3D) orientation of the semicircular canals, the location of the common crus, the relationship between the second genu of the facial nerve and the posterior semicircular canal, the relationship of the vestibule to the endolymphatic sac, the course of the subarcuate artery, and the relationship of the labyrinth to the internal auditory canal. Key surgical landmarks demonstrated in the course of this video include: posterior semicircular canal, superior semicircular canal, lateral semicircular canal, common crus, external genu of facial nerve, tympanic segment of the facial nerve, tegmen, vestibule, endolymphatic sac, endolymphatic duct, subarcuate artery.