Zone A: Intervallum side.
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/canals.
Carcass: Part of wall on intervallum side.
IW: Inner wall.
Non-porous: Canal lacking connecting pores or any other connection with adjacent canals.
Porous: Canal connected to its neighbors either by pores piercing mutual canal walls.
syn.: Simple communicating.
Spongiose: Massive inner wall consisting of elaborately waved, communicating canals.
syn.: Anastomosing communicating.
Type of carcass perforations: inner wall (IW) | |_ Porosity of carcass canals tubes zone A (IW)