IW horizontal to upwardly projecting canals

knowledge base : exist
structure : inner wall
Stipules : isn't included in the term
Carcass perforations: inner wall (IW) : Canals
Constitution of carcass canal system (IW) : isn't included in the term
Shape of carcass canals zone A (IW) : isn't included in the term
Porosity of carcass canals zone A (IW) : isn't included in the term
Relationship between carcass canals zone A and intersept (IW) : isn't included in the term
Direction of carcass canals zone A (IW) : Upwardly opening ; Horizontal opening
Building of carcass perforations (IW) : isn't included in the term
Carcass external plates: inner carcass wall (IW) : isn't included in the term
Type of morphological tubes (IW) : isn't included in the term
Additional sheath : isn't included in the term