| The pyloric valvule will separate the mesenteron from the proctodaeum making the final section of the intestine. |
| The mesenteron and Malpighian tubules are generally responsible for detoxification by accumulation of ingested metal salts in insects. |
| The mesenteron consists at first of a simple hypoblastic tube, which however becomes enveloped by a layer of splanchnic mesoblast. |
| The constriction shown by a longitudinal section of the transition area between the mesenteron and the proctodaeum is the pyloric valve. |
| It regulates the flow of material from the mesenteron to the proctodeum. |
| The splanchnopleure also envelops it, so that, morphologically speaking, the yolk lies within the mesenteron. |
