The region of transition between proventriculus and gizzard of ventriculus is named zona intermedia gastris that is present in the majority of birds. The stomach of birds is divided into two chambers: proventriculus ( proventriculus, pars glandularis) and gizzard ( ventriculus, pars muscularis) that is the muscular portion ( CALHOUN FARNER McLELLAND). Generally, the stomach of birds is descrebed as a very elastic muscle-membranous tube which extends from pharinx to proventriculus, containing, in the majority of birds a dilation next to thoracic cavity called craw ( FARNER WARNER et al., 1967 FITZGERALD, 1969 LIMA, 1977 McLELLAND.Įsophagus is internally lined by squamous stratified and cornified epithelium and presents esophagian mucous glands ( KADEN, 1936 LIMA, 1977). ( FARNER McLELLAND, 1979 KEHOE & ANKEY, 1985 JORDANO, 1987). The size of different portions of digestive tract of birds varies according to the type of alimentary habits The digestive tract of birds is descrited, in the literature as constituted by mouth limited by beak, salivary gland, tongue, pharinx, esophagus with ou without craw, stomach with proventriculus and ventriculus (gizzard), small intestine and large intestine, including caeci and coprodeum ( CALHOUN, 1954 FARNER, 1960 SELANDER, 1963 TONER, 1963 HELANDER, 1981). The tunica serosa of ventriculus is similar to that of proventriculus. Separated by a thin connective tissue, adjacent to lamina muscularis mucosae, there is the well developed tunica muscularis gastris with thick inner layer ( stratum circulare) and outer layer ( stratum longitudinale) showing between them plexus of Auerbach. ventricularis) followed by lamina mucosa gastris. The linning columnar epithelium with low folds connected by a thick cuticle ( cuticula gastrica) and simple tubular gland ( gll. In the ventriculus ( ventriculus, pars muscularis) situated caudally to proventriculus, histologically we found the same tunics of the antecessor, excepting the lack of tela submucosae gastris. The tunica serosa is constituted by connective tissue containing adipose cells, blood vessels and nervous elements of serous plexus. Between these two layers the connective tissue shows the presence of blood vessels and ganglion cells of Auerbach plexus. A well developed tunica muscularis gastris of smooth muscle presents internal stratum circulare and external stratum longitudinal. proventricularis gastris profundae, a branched tubular type gland that open to mucosae surface. The thick tela submucosae gastris is predomnantly constituted by numerous and exuberant gll. proventricularis superficiales and lamina muscularis mucosae), supported by corion, form the tunica mucosa gastris. On the proventriculus ( proventriculus, pars glandularis) the lining columnar mucous cells epithelium presents folds and superficial simple tubular gland ( gll. SUMMARY: A histological study of burrowing owl stomach, proventriculus and ventriculus was carried out under light microscopy. Histological aspects of the stomach of burrowing owl ( Speotyto cunicularia, MOLINA, 1782). ASPECTOS HISTOLOGICOS DEL ESTOMAGO DE LA LECHUZA HISTOLOGICAL ASPECTS OF THE STOMACH OF BURROWING OWL
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