The accessory Malpighian bodies, or at any rate one of them, appear to have curious relations to the segmental tubes.
Its development from segmental involutions has not been recognized.
They are from the first directed obliquely backwards, and coil close round the inner and dorsal sides of the segmental duct.
These cords constitute the rudiments of the segmental tubes.
The process of hollowing is continued backwards pari passu with the splitting of the segmental duct.
The segmental ducts in the larv open behind into the cloacal section of the alimentary tract.
It is octagonal in plan, segmental arches being thrown across the angles of the square base to support its diagonal sides.
Marshall holds that the olfactory nerve is a segmental nerve equivalent to the third, fifth, seventh etc. nerves.
After the masonry had hardened, piers were built on the arches to support the segmental timbers.
The segmental tubes of the mesonephros undergo further important changes.