Species‐specific differences of the avian oesophagus: Histological and Ultrastructural study

El-naseery, Nesma I.; Mohammed, Asmaa A A; Abuel-Atta, Ahmed Awad; Ghonimi, Wael

doi:10.1111/ahe.12721

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…According to some authors, the structure of esophageal surface epithelium in birds depends on the type of dietary specialization. Therefore, it can be non-keratinized, partially keratinized, or keratinized (Ibrahim, 1992;Kharchenko & Byrka, 2003;El-naseery et al, 2021).…”

Section: Micromorphology Of the Esophagusmentioning

confidence: 99%

Morphology of the Gastrointestinal Tract and its Lymphoid Tissue in the Common Blackbird (Turdus merula)

Dyshliuk

2024

Acta fytotechn zootechn

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The paper presents results of a microscopic study of the wall of the esophagus, stomach, and intestine and their lymphoid tissue in birds of the blackbird species. The material was selected from 10 adult blackbirds. It was embedded into paraffin according to the conventional method. The results of the study revealed that the general structure of the tunics of the esophagus, stomach, and intestine in the blackbird is similar to other birds, but exhibits certain characteristics. In the mucosa and submucosa of these organs, lymphoid tissue is noted, which is represented by different levels of structural organization. "Lymphocyte tracks" in the form of small diffuse lymphoid tissue cords are observed in the esophagus. Small accumulations of diffuse lymphoid tissue are also found in the muscular stomach. Solitary lymphoid nodules in the glandular stomach were found not only in the mucosa but also in the subserosa of the serosa. The largest accumulations of lymphoid tissue are observed in the esophageal and cecal tonsils and aggregated lymphoid nodules of the intestines, which are areas of significant penetration of antigens into the body of birds. In the places where they are located, infiltration of surface epithelium and crypts by lymphoid cells is observed. The smallest area of these immunocompetent structures is occupied by diffuse lymphoid tissue and much larger -by lymphoid nodules. The results of the research allowed to assess the morphofunctional status of lymphoid formations in the organs of the digestive canal of the blackbird and, accordingly, to determine the state of their immune system.

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Section: Micromorphology Of the Esophagusmentioning

confidence: 99%

Morphology of the Gastrointestinal Tract and its Lymphoid Tissue in the Common Blackbird (Turdus merula)

Dyshliuk

2024

Acta fytotechn zootechn

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“…These results suggested that the dramatic morphological changes observed in crop sections corresponded to extreme transcriptomic reprogramming (Fig 2A and 2B) that reflected marked differences in female crop function among different breeding stages. It is important to note that the composition of crop cells undergoes significant change during breeding stages [15][16][17][18][19][20]. However, our bulk RNA-seq analyses only provide the average values of cell mixtures, thereby concealing cellular heterogeneity.…”

Section: Plos Geneticsmentioning

confidence: 99%

“…Crop mucosa consist of stratified squamous epithelial cells, including basal layer (undifferentiated cells, at the innermost of mucosa), a spinous layer (postmitotic cells), a granular layer (harboring flat cell), and a keratin layer (keratinized cells, at the surface of mucosa, which sloughs off to form pigeon 'milk') [3,6,[15][16][17][18][19][20]…”

Section: Spatially Resolved Transcriptomics In the Crop Of 'Lactating...mentioning

confidence: 99%

Spatio-temporal transcriptome dynamics coordinate rapid transition of core crop functions in ‘lactating’ pigeon

Wang,

Luo

et al. 2023

PLoS Genet

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Pigeons (Columba livia) are among a select few avian species that have developed a specialized reproductive mode wherein the parents produce a ‘milk’ in their crop to feed newborn squabs. Nonetheless, the transcriptomic dynamics and role in the rapid transition of core crop functions during ‘lactation’ remain largely unexplored. Here, we generated a de novo pigeon genome assembly to construct a high resolution spatio-temporal transcriptomic landscape of the crop epithelium across the entire breeding stage. This multi-omics analysis identified a set of ‘lactation’-related genes involved in lipid and protein metabolism, which contribute to the rapid functional transitions in the crop. Analysis of in situ high-throughput chromatin conformation capture (Hi-C) sequencing revealed extensive reorganization of promoter-enhancer interactions linked to the dynamic expression of these ‘lactation’-related genes between stages. Moreover, their expression is spatially localized in specific epithelial layers, and can be correlated with phenotypic changes in the crop. These results illustrate the preferential de novo synthesis of ‘milk’ lipids and proteins in the crop, and provides candidate enhancer loci for further investigation of the regulatory elements controlling pigeon ‘lactation’.

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Anatomical, histological, and scanning electron microscopic features of the esophagus and crop in young and adult domestic pigeons (Columba livia Domestica)

Mahdy,

Mohammed

2024

BMC Vet Res

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Background Pigeons (Columba livia) are mainly raised as a source of animal protein, racing, leisure and as an experimental animal. The present study investigated the morphology of the esophagus in the young and adult domestic pigeon, Columba livia domestica. Methods Ten young and ten adult, normal, and healthy pigeons were collected from the local breeders. Samples from different parts of esophagus and crop were examined grossly, by stereomicroscopy, scanning and light microscopy. Results The esophagus consisted of a long cervical part, a crop, and a short thoracic part. The crop was represented by a thin-walled outpouching with two lateral diverticula. The mucosa presented wavy fine folds in the cervical esophagus, irregular folds in the lateral diverticula giving it a corrugated appearance, and prominent longitudinal folds with several gland openings in the middle and lower parts of the crop, as well as in the thoracic esophagus. The density of gland openings was higher in adult pigeons than that in young pigeons. The mucosa of the esophagus was lined by non-keratinized stratified squamous epithelium. The shape, height, and branching of the mucosal folds differed between young and adult pigeons. Mucous-secreting alveoli were detected in the middle part of the crop as well as in the thoracic esophagus, but not in the cervical esophagus or lateral diverticula of the crop. Conclusion The variations between the young and adult pigeons suggest a functional adaptation of adult pigeons to their diet compared to young pigeons.

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Species‐specific differences of the avian oesophagus: Histological and Ultrastructural study

Cited by 4 publications

References 20 publications

Morphology of the Gastrointestinal Tract and its Lymphoid Tissue in the Common Blackbird (Turdus merula)

Morphology of the Gastrointestinal Tract and its Lymphoid Tissue in the Common Blackbird (Turdus merula)

Spatio-temporal transcriptome dynamics coordinate rapid transition of core crop functions in ‘lactating’ pigeon

Anatomical, histological, and scanning electron microscopic features of the esophagus and crop in young and adult domestic pigeons (Columba livia Domestica)

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