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
Description
This video covers the key steps of a cortical mastoidectomy and facial recess approach 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. The first part of this video demonstrates a basic cortical mastoidectomy and focuses on fundamental principles including the preservation of the tegmen and sigmoid plate, adequate posterior canal wall thinning, continual saucerization, adequate removal of air cells, and early identification of the lateral semicircular canal and incus. The second part of the video discusses the facial recess approach and enlightens the viewer on the boundaries of the facial recess, the course of the mastoid segment of the facial nerve, and the location of the round window. Key surgical landmarks demonstrated in the course of this video include: zygomatic root, temporal line, posterior meatal wall, Henle’s spine, mastoid tip, tegmen mastoideum, sigmoid sinus, Koerner’s septum, lateral semicircular canal, incus, incus buttress, chorda tympani nerve, mastoid segment of the facial nerve, facial recess, round window niche, and round window.
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 shows the key steps in the dissection of the endolymphatic sac 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 one of our video series and demonstrates fundamentals of endolymphatic surgery including the location and appearance of the endolymphatic sac, and its relationship to the labyrinth. Key surgical landmarks demonstrated in the course of this video include: sigmoid sinus, mastoid segment of the facial nerve, retrofacial air cells, endolymphatic sac, lateral and posterior semicircular canal, and Donaldson’s line
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 covers the key steps of a lateral temporal bone resection 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 two of our video series. This approach allows for the en bloc removal of the external auditory canal and demonstrates fundamental steps of the procedure including: the propagation of a superior trough between the tegmen and the superior aspect of the external auditory canal, the extension of the facial recess inferiorly with sacrifice of the chorda tympani, and the drilling of the hypotympanic bone towards the glenoid. At the completion of the demonstration, the viewer is afforded a labelled view of the medial wall of the mesotympanum, as well as the medial aspect of the external auditory canal with an intact tympanic membrane. Key surgical landmarks demonstrated in the course of this video include: tegmen, zygomatic root, malleus, incus, stapes, glenoid, eustachian tube, mastoid segment of the facial nerve, chorda tympani nerve, facial recess, hypotympanic space, annular bone, tensor tympani tendon, cochlear promontory, pyramidal process, round window, and lateral semicircular canal.
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.
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 key steps in the dissection of the internal auditory canal 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 four of our video series and demonstrates fundamental steps involved in the dissection of the internal auditory canal including: establishing an inferior trough and identification of the cochlear aqueduct, establishing a superior trough and identification of the labyrinthine segment of the facial nerve, and blue-lining the internal auditory canal from porous to fundus. Key surgical landmarks demonstrated in the course of this video include: internal auditory canal, cochlear aqueduct, meatal segment of the facial nerve, labyrinthine segment of the facial nerve, 1st genu of the facial nerve, tympanic segment of the facial nerve, 2nd genu of the facial nerve, mastoid segment of the facial nerve.
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 key steps in the infratemporal approach 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 five of our video series and demonstrates fundamental steps of the procedure including: decompression and mobilization of the facial nerve, dissection of the cochlear scalae, skeletonization of the carotid artery, and entry into the jugular bulb. We demonstrate the wide opening of the jugular bulb to facilitate visualization of the medial wall of the jugular bulb, which subsequently aids in the dissection of the pars nervosa. Key surgical landmarks demonstrated in the course of this video include: sigmoid sinus, jugular bulb, mastoid segment of the facial nerve, cochlear scalae, internal carotid artery, pars nervosa
