From a traditional terminology to an adapted one

With participation of vertical intervallar structures

With participation of vertical intervallar structures: Formed by fluting of inner edge of septa.

Vertical intervallar structures: Longitudinal and often radial structures inside the intervallum (septa, taeniae…).

Without participation of vertical structures

Vertical intervallar structures: Longitudinal and often radial structures inside the intervallum (septa, taeniae…).

isn't included in the term

Hierarchy

Carcass perforations: inner wall (IW)
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 |_ Building of carcass perforations (IW)