The small oval depression found on the interatrial septum in an adult human is termed as:

Foramen ovale

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Fossa ovalis

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Foramen of monro

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Foramen of magnum

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Solution

The correct option is B Fossa ovalis
The interatrial septum is a partition between the left and right atria. It is placed slightly towards the left, so the right atrium is slightly bigger than the left. An oval depression (fossa ovalis) is present on its posterior side. It is the remnant of the foramen ovale, which is present in the foetal stage but closes at birth.
So, the correct answer is option B.

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