Morfologia do esôfago e do papo de perdizes <em>Rhynchotus rufescens</em> (Tiramidae)

Abstract

ABSTRACT. Twenty adult partridges Rhynchotus rufescens were used to study the morphology of oesophagus and crop. Materials to the morphologic study were collected and lengths of the oesophagus and of the crop were measured. For histological study, fragments of the oesophagus and of the crop were stained routinely with Masson's trichrome stain. Total oesophagus was larger in females. In the entrance of the thorax, its ventral wall is enlarged broadly, forming the crop, which is larger in males. Oesophagus mucosa is constituted by stratified squamous epithelium, with mucous glands and lymphatic tissues. There are three layers of smooth muscle, involved in serosa. The histological structure of the crop is similar to the oesophagus. The mucous glands are reduced in size and the lymphatic tissues are dispersed in the connective tissue. There is a thin stratum of smooth muscle and other two wider layers of longitudinal and circular musculature.Key words: oesophagus, crop, partridge, morphology.RESUMO. Morfologia do esôfago e do papo de perdizes Rhynchotus rufescens (Tiramidae). Vinte exemplares de Rhynchotus rufescens foram utilizadas para estudar a morfologia do esôfago e do papo. O material para o estudo morfológico foi coletado e o comprimento dos órgãos foi avaliado. Para o estudo histológico, as secções histológicas foram coradas com tricromo de Masson, posteriormente analisadas e descritas. O comprimento médio total do esôfago foi maior em fêmeas. Na entrada do tórax, a parede ventral do esôfago se dilata, formando o papo, maior em machos. A mucosa do esôfago é formada por epitélio escamoso estratificado, com glândulas mucosas e nódulos linfáticos. Há três camadas de músculo liso, as quais são envolvidas por serosa. A característica histológica do papo é semelhante à do esôfago. No papo, as glândulas mucosas são menores e os nódulos linfáticos estão dispersos no tecido conjuntivo. Há uma camada delgada de músculo liso e outras duas camadas mais largas de musculaturas longitudinal e circular.

Macro‐ and microstructures of the digestive tract in the Eurasian collared dove, Streptopelia decaocto (Frivaldszky 1838): Adaptive interplay between structure and dietary niche

“…Several investigations found that the functional association, despite showing no convergence across avian species, could not be discarded according to the absence of these glands in the context of our study. In contrast, the esophagus of Lanius tephronotus (Zhu, 2015b), Gallus gallus domesticus (Ventura et al, 2013), Rhynchotus rufescens (Rossi et al, 2006), Ross broiler chickens (Mobini, 2014), Columba livia (Kausar, 2019), and Meleagris gallopavo (Yovchev & Penchev, 2019) has mucous glands in both the cervical and thoracic regions.…”

The developmental architecture of the crop of quail embryos (Coturnix coturnix): Morphometric, light and scanning electron microscopy

“…The present findings revealed that the oesophagus of the quail was divided into three parts; cervical, crop and thoracic parts similar to those reported in quails (Wilkinson et al., 2018; Zaher et al., 2012), common quail (Parchami & Dehkordi, 2011), rock doves (Shawki et al., 2021), Eurasian collared doves (El‐Mansi et al., 2021), homing pigeon (Kadhim & Mohamed, 2015), guinea fowl (Gosomji et al., 2016), geese (Shehan, 2012), Grey‐Backed Shrike (Zhu, 2015), partridge (Rossi et al., 2006) and white stork (Rus et al., 2000). In contrast, the oesophagus of captive bustards (Bailey et al., 1997), rheas (Rodrigues et al., 2012) and white‐breasted kingfisher (Al Kinany, 2017) consists of two parts; cervical and thoracic, with no crop.…”

“…It is formed of cervical and thoracic parts in addition to the crop (Zhu, 2015). The avian crop ( ingluvies ) is represented by a dilated pouch of the cervical oesophagus immediately before entering the thoracic cavity (Hashem, 2018; Rossi et al., 2006; Zaher et al., 2012). Its wall is associated to the skin and to the clavicle ( clavicula s. furcular ) by loose connective tissue, additionally to the sternum by musculus compressor ingluvialis (Langenfeld, 1992).…”

“…The avian crop (ingluvies) is represented by a dilated pouch of the cervical oesophagus immediately before entering the thoracic cavity (Hashem, 2018;Rossi et al, 2006;Zaher et al, 2012).…”