osteology dropout

The professor for the class I TA for, Biological Anthropology, was absent today, so she had me supervise the class tonight and be on hand to answer any questions. They were supposed to work on a study guide for their final exam, split up in groups working on different topics. I barely remember this stuff so I start doing what I do best: play Yahoo! Euchre.

Suddenly, one girl looks to me and says, "Hey! Stop playing card games online! You're supposed to be a smarty pants right? You already graduated? What's the super orbital torus?"

Ergh, dropping that damned Osteology grad course has come back to bite me in the butt. I input "super orbital torus" in my mind archives and come up blank. I try "orbital anything" and a hazy image of a skull feature pops up. Sweet. "It's part of a skull," I replied, relieved to step up to the plate when called out.

"We already know that. But what IS it?"
Crap.
"It's here," I answer, simultaneously brushing my face behind my ear, smoothing an eyebrow, and rubbing my forehead.

Must. Review. Australopithecines.