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Brunner's glands of the duckbilled platypus (Ornithorhynchus anatinus)
- Source :
- American Journal of Anatomy. 132:147-165
- Publication Year :
- 1971
- Publisher :
- Wiley, 1971.
-
Abstract
- Brunner's glands in the platypus form a lobulated, glandular collar confined to the submucosa of the most distal portion of the stomach. The glands end immediately proximal to the gastrointestinal junction and excretory ducts empty in the region where the stratified squamous epithelium lining the stomach changes abruptly to the intestinal lining epithelium of the duodenum. An individual gland of Brunner is composed of several elongate lobules drained by intralobular ducts which often join to form a single excretory duct. Light and electron microscopic studies have shown the secretory tubules to be comprised of large, pyramidal cells limited basally by a delicate basal lamina. The ergastoplasm, cisternae of which are dilated and contain amorphous material, is associated with numerous ribosomes. In basal and perinuclear regions intercisternal granules and smooth surfaced vesicles are found. Numerous small vesicles found in supranuclear areas apparently form from the smooth membrane portions of ergastoplasm located adjacent to Golgi complexes. Membrane-bound amorphous granules of varying electron density occupy the apical cytoplasm and show a tendency to coalesce before emptying their contents into the adjacent lumen. The intralobular duct system is lined initially by a columnar epithelium which changes to a simple squamous form before the ducts combine to form a short excretory duct lined by stratified squamous epithelium. The epithelium lining the duct system contains relatively few organelles but appears to be engaged in a limited amount of synthesis and release of secretory material. Histochemical studies indicate that both the secretory tubules and the duct system elaborate a neutral mucopolysaccharide.
- Subjects :
- Cytoplasm
Pathology
medicine.medical_specialty
Duodenum
Golgi Apparatus
Stratified squamous epithelium
Biology
Cytoplasmic Granules
medicine
Animals
Apical cytoplasm
Glycosaminoglycans
Mammals
Histocytochemistry
Dissection
Intralobular duct
Epithelial Cells
Anatomy
Epithelium
Organoids
Microscopy, Electron
medicine.anatomical_structure
Excretory system
Brunner's glands
Adenomere
Basal lamina
Ribosomes
Subjects
Details
- ISSN :
- 15530795 and 00029106
- Volume :
- 132
- Database :
- OpenAIRE
- Journal :
- American Journal of Anatomy
- Accession number :
- edsair.doi.dedup.....35ce602214a76313b601edbee12e6dad