The tegmen tympani, also known as the tegmental wall or roof of the tympanic cavity, is a thin plate of the petrous part of the temporal bone that separates the intracranial compartment and middle ear.
Relations and/or Boundaries
- anteriorly, roof of the canal for the tensor tympani muscle
- posteriorly, roof of mastoid antrum (other parts of the tegmen: tegmen mastoideum or tegmen antri)
- laterally, squamous part of temporal bone (petrosquamous suture)
- superiorly, dura of middle cranial fossa
- inferiorly, epitympanum (attic of middle ear cavity)
- acquired cholesteatoma: the structure can be eroded by an enlarging cholesteatoma
- cerebrospinal fluid leak, meningocele or meningoencephalocele to the middle earcan be caused by interruption of the structure
History and etymology
Tegmen is derived from the Latin word tegere, to cover.