Skull osteology

Why this matters

The skull is usually taught as twenty-two names and thirty holes to memorise. It is better understood as eight spaces separated by shared walls — because once you know that a wall faces two rooms, you can predict where a problem in one room will appear next. That single habit explains an oroantral communication, a root in the antrum, a blow-out fracture and a sinusitis of dental origin, and it is what the next fifteen lessons will hang on.

The big picture

Bone in the skull is arranged as thin sheets stretched between thick pillars. The pillars carry force; the sheets separate spaces and are where fractures run and infections cross. Foramina are the doors between those spaces, and almost every clinically important landmark is either a pillar, a sheet or a door.

The 14 cards in this lesson

1. 01Rooms, walls and doors
2. 02Twenty-two bones, and what the count hides
3. 03Five views, and what each is for
4. 04Every wall has two names
5. 05Sutures, and the points they leave behind
6. 06Clinical alert — in the lesson
7. 07The cranial base: three steps and one keystone
8. 08Foramina are doors: from which room to which
9. 09The bone that lies: normal anatomy misread
10. 10The maxilla: thin walls between thick pillars
11. 11The maxillary bone you inject into, drill and break
12. 12The mandible: a curved beam with a tunnel through it
13. 13Landmarks are distributions, not addresses
14. 14The alveolus is temporary

You have got it when

You are ready when you can name what lies on the other side of any wall you drill through, find the mandibular foramen without a landmark list, and say why the 2 mm rule anterior to the mental foramen is not a safety margin.