Abstract: The current study aimed to maximize the information on histology of Japanese quail digestive tract. Specimens from proventriculus and gizzard of post-hatching Japanese quail were embedded in paraffin and processed for microscopic examination. Grimelius silver impregnation technique was applied to localize the argyrophil endocrine cells. Quail stomach wall was presented by mucosa, submucosa, muscularis and serosa. Mucosa of the proventriculus formed plicae and sulci, which were lined by Periodic Acid Schiff reagent (PAS) and alcian blue positive simple columnar epithelium. The lamina propria connective tissue contained lymphocytic infiltration and lymphatic aggregates. Compound tubuloalveolar glandular lobules were located within muscularis mucosa. Each lobule consisted of uncoiled tubules radiating from a central cavity into which they discharge. The tubules contained negatively stained PAS and alcian blue secretory oxyntico-peptic cells. Many lobules opened together upon raised papillae into the lumen of the proventriculus via common large duct. The gizzard mucosa is covered by PAS, alcian blue and trichrome positive keratinized layer and formed of folds lead to tubular glands in the lamina propria. The gizzard glands were lined mostly with cuboidal cells. No muscularis mucosa was seen in the gizzard. The transitional areas between the proventriculus and the gizzard and between the gizzard and the duodenum had features similar to both portions before and after junctions. Argyrophil endocrine cells were abundant in the proventriculus and absent in the gizzard. Some morphometrical and histo-morphometrical growth kinetics during different stages of development were reported. These observations should be considered when studying quail digestion physiology.