petrosquamous fissure

pet·ro·squa·mous fis·sure

[TA]
a shallow fissure indicating externally the line of fusion of the petrous and squamous portions of the temporal bone.
Synonym(s): fissura petrosquamosa [TA]
References in periodicals archive ?
The cartilaginous portion of the eustachian tube is located in the petrosquamous fissure of the temporal bone, which is near the occipital and sphenoid bones.