Canal: Pore modified by skeletal structure thikening or by lintels streching. Canal length is greater than perforation diameter.
Lintel: Skeletal structure separating and bounding adjacent pores.
Carcass: Part of wall on intervallum side.
IW: Inner wall.
Carcass perforations: inner wall (IW) | |_ Constitution of carcass canal system (IW) | |_ Building of carcass canals (IW) {1 zone , isn't included in the term} | |_ Shape of carcass canals zone B (IW) {1 zone , isn't included in the term} | |_ Direction of carcass canals zone B (IW) {1 zone , isn't included in the term} | |_ Porosity of carcass canals zone B (IW) {1 zone , isn't included in the term}