Bill bar

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
Share article

Article information

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

Support Radiopaedia and see fewer ads

Cases and figures

  • Drag
    Figure 1: diagram of a saggital view of the IAM
    Drag here to reorder.
  • Updating… Please wait.

    Alert accept

    Error Unable to process the form. Check for errors and try again.

    Alert accept Thank you for updating your details.