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At the time the article was created Frank Gaillard had no recorded disclosures.View Frank Gaillard's current disclosures
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Bill bar (TA: crista verticalis) also known as the vertical crest, is a bony anatomical landmark that divides the superior compartment of the internal acoustic meatus into an anterior and posterior compartment. Anterior to Bill bar, in the anterior superior quadrant, are the facial nerve (CN VII) and nervus intermedius, and posterior to it, in the posterior superior quadrant is the superior division of the vestibular nerve (see figure 1). The upper quadrants are separated from the lower quadrants by the falciform crest.
A recent study comparing the ability of a clinical 7 T magnet to distinguish the finer inner ear anatomy, in comparison with a 3 T magnet, found that Bill bar was occasionally visible at both field strengths 4. It has generally not been possible to see on HRCT of the temporal bone.
History and etymology
Bill bar was named after William Fouts House (1923-2012), an American otologist, who was known informally as "Dr Bill".
- 1. FRCS CSS. Last's Anatomy. Churchill Livingstone. (1999) ISBN:0443056110. Read it at Google Books - Find it at Amazon
- 2. Clemente CD. Anatomy. Lippincott Williams & Wilkins. (2011) ISBN:1582558892. Read it at Google Books - Find it at Amazon
- 3. Hughes GB, Pensak ML. Clinical Otology. Thieme. (2011) ISBN:1604064757. Read it at Google Books - Find it at Amazon
- 4. van der Jagt MA, Brink WM, Versluis MJ, Steens SC, Briaire JJ, Webb AG, Frijns JH, Verbist BM. Visualization of human inner ear anatomy with high-resolution MR imaging at 7T: initial clinical assessment. (2015) AJNR. American journal of neuroradiology. 36 (2): 378-83. doi:10.3174/ajnr.A4084 - Pubmed