Difference between revisions of "Proventriculus - Anatomy & Physiology"
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Revision as of 15:59, 5 July 2010
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Introduction
The proventriculus is also referred to as the glandular stomach. It is connected by the isthmus to the gizzard.
Structure and Function
- A storage organ in fish and flesh eating birds
- Appropriate to a soft diet
- Secretes digestive enzymes
- Contacts the left lobe of the liver ventrally and laterally
- Related dorso-caudally to the spleen
- More cranial than the gizzard
- Lies to the left of the midline of the bird
- Spindle/fusiform shaped
- Roughly 4cm long
- Lumen diameter similar to the oesophagus
- No oesophageal sphincter
Histology
- Mucous cells
- Columnar epithelium
- Basophilic
- Papillae- through which collecting ducts from glands run
- Lamina propria run into the papillae
- Hydrochloric acid and pepsin produced
- Glands in the submucosa
- Single tubular glands are grouped into lobules with a common opening into a papillae
- Serous membrane of mesothelial cells attached to the outer longitudinal layer of muscle
- 3 layers of lamina muscularis
- No parietal cells