Pore: Simple perforation of any skeletal structure. Pore diameter is greater than thickness of the structure.
Intersept: Part of a wall or intervallum between two adjacent radial vertical structures (septa, taeniae…).
Carcass: Part of wall on intervallum side.
IW: Inner wall.
Carcass perforations: inner wall (IW) | |_ Relationship between rows of carcass pores and intersept (IW)