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From my understanding, a foramen is a round opening inside a bone, whilst a fissure is a slightly longer opening? What exactly qualifies a fissure as a fissure and not a foramen? Why is the superior orbital fissue not a foramen?

4

That's right, the difference is in the shape.

According to dictionary, a fissure is:

  1. A narrow opening produced by cleavage or separation of parts.
  2. ...
  3. Anatomy. A natural division or groove in an organ, as in the brain.

Whilst a foramen usually describes a (somewhat) round "hole".

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