The proventriculus is a standard part of avian anatomy, and is a rod shaped organ, located between the Oesophagus and the Ventriculus of most birds. It is generally a glandular part of the stomach that may store and/or commence digestion of food before it progresses to the gizzard. The primary function of the proventriculus is to secrete Hydrochloric acid and Pepsinogen into the digestive compartments that will churn the ingested material through muscular mechanisms. Pepsinogen produces pepsin, which breaks the peptide bonds found in amino acids. The muscle contractions of the gizzard push material back into the proventriculus, which then contracts to mix materials between the stomach compartments. This transfer of digested material can occur up to 4 times per minute, and the compartments can hold the stomach contents for thirty minutes to an hour.
The Encarta (2007) holds that the proventriculus is:
The proventriculus is the glandular portion of the avian compound stomach, and a rather peculiar organ it is. There's nothing like it in mammals.
Chicken proventriculus is eaten as street food in the Philippines. It is dipped in flour and deep fried until golden brown. It is served best with spiced vinegar and is often sold in a small kiosk. This dish is called proben.
- Encarta World English Dictionary [North American Edition] (2007). Proventriculus. Source:  (accessed: December 18, 2007)
- Zaher, Mostafa (2012). "Anatomical, histological and histochemical adaptations of the avian alimentary canal to their food habits: I-Coturnix coturnix" (PDF). Life Science Journal. 9: 252–275.
- Source:  (accessed: December 18, 2007)
- Svihus, Birger (2014). "Function of the Digestive System". The Journal of Applied Poultry Research. 23: 306–314.
- Moran, Edwin (2016). "Gastric digestion of protein through pancreozyme action optimizes intestinal forms for absorption, mucin formation and villus integrity". Animal Feed Science and Technology. 221: 384–303.
- Caceci, Thomas (undated). Proventriculus. Source:  (accessed: December 18, 2007)
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