HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Takegoshi, H. Articles by Ito, K. Search for Related Content PubMed PubMed Citation Articles by Takegoshi, H. Articles by Ito, K.

Facial Canal Anatomy in Patients with Microtia: Evaluation of the Temporal Bones with Thin-Section CT¹

¹ From the Department of Otorhinolaryngology, Faculty of Medicine, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan. Received May 21, 2001; revision requested July 9; final revision received March 28, 2002; accepted May 13. Address correspondence to H.T. (e-mail: takegosi@saitama-med.ac.jp).

View larger version (34K): [in a new window]   Figure 1. Abbreviations used throughout the article.

View larger version (129K): [in a new window]   Figure 2a. (a) Transverse thin-section CT image obtained at the level of the basic scan. basic point = the Bill bar, basic line = line between the basic point and midpoint of the porus acusticus, G = GF midpoint, BG-D = line between the basic point and GF midpoint, B-A = angle between the basic line and BG-D, BGF-A = angle between the labyrinthine segment and the proximal tympanic segment of the facial canal. (b) Transverse thin-section CT image obtained at the level of the tympanic segment of the facial nerve. basic line = line between the basic point and midpoint of the porus acusticus, G = GF midpoint, F = most posterior point of the facial canal, GF-D = line between G and F, F-A = angle between the basic line and GF-D, L = most lateral point of the temporal bone on the line that makes a 135° angle with GF-D, FL-D = line between F and L.

View larger version (146K): [in a new window]   Figure 2b. (a) Transverse thin-section CT image obtained at the level of the basic scan. basic point = the Bill bar, basic line = line between the basic point and midpoint of the porus acusticus, G = GF midpoint, BG-D = line between the basic point and GF midpoint, B-A = angle between the basic line and BG-D, BGF-A = angle between the labyrinthine segment and the proximal tympanic segment of the facial canal. (b) Transverse thin-section CT image obtained at the level of the tympanic segment of the facial nerve. basic line = line between the basic point and midpoint of the porus acusticus, G = GF midpoint, F = most posterior point of the facial canal, GF-D = line between G and F, F-A = angle between the basic line and GF-D, L = most lateral point of the temporal bone on the line that makes a 135° angle with GF-D, FL-D = line between F and L.

View larger version (37K): [in a new window]   Figure 3. Diagram from the right lateral view indicates the level from the GF to the oval window (GO level), the level from the oval window to the round window (OR level), and the level under the round window (UR level). Figure shows the horizontal semicircular canal (1), malleus (2), incus (3), stapes (4), round window (5), and the labyrinthine (a), tympanic (b), and mastoid (c) portions of the facial nerve.

View larger version (25K): [in a new window]   Figure 4. Graph based on data from transverse reconstructed images shows the facial nerve course from the mean x and y values in each group. Uni-MN = unilateral microtia, bilateral examination; Uni-M = unilateral microtia, unilateral examination; Bi-M = bilateral microtia and examination.