: What is the difference between a foramen and a fissure? 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

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

According to dictionary, a fissure is:

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

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