Septum (general)

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

Terminology

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 . 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.