Descriptor : Direction of carcass canals zone A (IW)
Descriptor type : categorical
NB: Convention: Tube begins on intervallum side.
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.
Carcass: Part of wall on intervallum side.
IW: Inner wall.
- Upwardly opening
-
Upwardly opening: Opening on intervallum side is lower down than the other one.
Upwardly projecting
- Downwardly opening
-
Downwardly opening: Opening on intervallum side is higher than the other one.
Downwardly projecting
- Lateral opening
-
Lateral
- Horizontal opening
-
Horizontal opening: Opening on intervallum side is as high as the other one.
Horizontal
