Bill bar

Dr Dan J Bell and A.Prof Frank Gaillard et al.

Bill bar is a landmark that divides the superior compartment of the internal acoustic meatus into an anterior and posterior compartment. Anterior to Bill's 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). It is generally not possible to see Bill bar, even on high-resolution CT or MRI internal acoustic canal scans.

History and etymology

It was named after William Fouts House (1923-2012), an American otologist, who was known informally as "Dr. Bill".

Head and neck anatomy
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Article information

rID: 994
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Bill's bar

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Cases and figures

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    Figure 1: diagram of a saggital view of the IAM
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