tympanosquamous fissure

tym·pa·no·squa·mous fis·sure

[TA] the fissure that separates the tympanic part of the temporal bone from the squamous part; it is continuous medially with the petrotympanic fissure and the petrosquamous fissure. Synonym(s): fissura tympanosquamosa [TA], squamotympanic fissure