| 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. |
| Hence when the stomach develops from the foregut, as a specialized segment of the same, it is supplied by vagus branches. |
| That price is the very absence of the selenodont specializations, the most obvious of which is foregut fermentation. |
| The foregut as defined here should be composed of ingesta and fish-derived material including digestive enzymes. |
| During its life cycle, Y. pestis colonizes the flea midgut and can form a biofilm in the proventricular valve in the foregut. |
