| These novel morphological approaches to the study of the ommatidia and the foregut ossicles may have limited application in the fossil record. |
| As long as food is present in the foregut, the threshold is raised by signals from distension receptors in that area. |
| These grow inward and eventually fuse to form the endoderm of the midgut, while ectoderm is dragged inward behind them at each end to form the foregut and the hindgut. |
| The commencing heart, formed at this stage of two distinct tubes, is attached to the ventral side of the foregut. |
| From the mouth, the esophagus leads to the foregut and then intestine, where digestion and absorption occur. |
| The rumen, reticulum and omasum can be compared to a kind of foregut fermentation chamber. |
