Last revised by Pir Abdul Ahad Aziz Qureshi on 23 Jul 2021

Septa (singular: septum) are anatomical or pathological sheet-like structures that subdivide a component of normal anatomy or a lesion.


Septa is the plural of the Latin word septum. Septae and septi are erroneous forms and are not words in English, nor correct plurals in Latin 2. Septation is frequently used as a synonym for septum, but this is strictly incorrect. Instead, septation ideally is used to describe the dividing up of a lesion or anatomical space by a septum/septa.

History and etymology

In Latin septum means a fence, hence its customary medical usage.

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