Hypotympanum

Dr Craig Hacking and Dr Daniel J Bell et al.

The hypotympanum refers to the portion of the tympanic cavity lying inferior to the level of the inferior margin of the external acoustic canal (EAC).

Gross anatomy

The hypotympanum is the smallest of the three compartments that make up the tympanic cavity and is a shallow depression in the floor of the middle ear. It is separated from the mesotympanum by an axial plane drawn between the inferior cochlear promontory and the tympanic annulus. Anteriorly is the opening into the Eustachian tube which passes anteromedially to the nasopharynx.  

Anatomy: Head and neck
Share article

Article information

rID: 57540
System: Head & Neck
Section: Anatomy
Synonyms or Alternate Spellings:
  • Floor of the tympanic cavity

Support Radiopaedia and see fewer ads

Cases and figures

  • Case 1: middle ear anatomy: annotated CT
    Drag here to reorder.
  • Updating… Please wait.

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

     Thank you for updating your details.