ante operculum (an"teoperkulum)

[NL., of the orbit, transmitting the superior maxillary division of the trifacial nerve, and in some cases, as among rodents, the ma eter muscle. It corresponds to the suborbital foramen of human anatomy. It is frequently a formation so large and variable as to afford zoological characters, as is the case in the Rodent i a.- Anteorbital proce , in mammalian an at., a spur of the frontal bone on the anterior and upper portion of the margin of the orbit.