前胃鸟类胃的一部分，分泌消化酶，把食物从嗉囊排到胗。
The division of the stomach in birds that secretes digestive enzymes and passes food from the crop to the gizzard.
扩头蔡白蚁工蚁的嗉囊、前胃和囊形胃的长度和宽度明显大于黑翅土白蚁（P<0.01）。
The crop, proventriculus and paunch of workers in T. ampliceps is evidently longer and wider than in O. formosanus (P<0.01).
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