trigeminal impression

tri·gem·i·nal im·pres·sion

[TA]
a depression on the anterior surface of the petrous portion of the temporal bone, near the apex, formed in relationship to the trigeminal ganglion.
Synonym(s): impressio trigeminalis [TA]
References in periodicals archive ?
The Gasserian ganglion rests in a groove, the trigeminal impression, on the petrous portion of the temporal bone (Kruger & Young, 1981).