The juvenile NZ fur seal (Arctocephalus forsteri) mandible under normal photographic conditions, with the dentition removed.
Right mandible of juvenile NZ fur seal (Arctocephalus forsteri), showing the alveoli;
lower photograph is slower shutter speed.
Then I got to thinking, what else can I show with this? I took one of the two skulls and turned on the LED light, and found that it would indeed show some of the brain surface topography that is imprinted on the endocast of the skull. I've got some more photos, and it turned out quite well I think. Now, I'm not sure what sort of practical application this could have other than being a cheap alternative to X-rays in somewhat rare cases like this, but maybe somebody will think of some useful way to use this for delicate osteological specimens.
Illuminated braincase showing some impressions of sulci and gyri.