mastoid fontanelle

mas·toid fon·ta·nelle

[TA]
the membranous interval on either side between the mastoid angle of the parietal bone, the petrous portion of the temporal bone, and the occipital bone.

mas·toid fon·ta·nelle

(mastoyd fontă-nel) [TA]
Membranous interval on either side between mastoid angle of parietal bone, petrous portion of temporal bone, and occipital bone.
References in periodicals archive ?
If the lambdoid suture fuses, the brain is forced to expand into the mastoid fontanelle just below it.