Morphological and ultrastructural characteristics of the tongue of wild boar

Gabriela de Souza  Reginato; Gabriela Klein  Barbosa; Amanda Olivotti  Ferreira; Bruno Gomes   Vasconcelos; Rose Eli Grassi  Rici; Ii-sei Watanabe; Adriano Polican Ciena

doi:10.4081/ejh.2020.3128

https://doi.org/10.4081/ejh.2020.3128

Authors

Gabriela de Souza Reginato Laboratório de Morfologia e Atividade Física–LAMAF, Universidade Estadual Paulista–UNESP, Rio Claro, Brazil. https://orcid.org/0000-0002-7322-4916
Gabriela Klein Barbosa Laboratório de Morfologia e Atividade Física–LAMAF, Universidade Estadual Paulista–UNESP, Rio Claro, Brazil. https://orcid.org/0000-0003-2207-3844
Amanda Olivotti Ferreira Faculdade de Ciências da Saúde de Unaí-MG, Brazil.
Bruno Gomes Vasconcelos Universidade Federal dos Vales do Jequitinhonha e Mucuri - ICA, Unaí, Brazil.
Rose Eli Grassi Rici Departamento de Cirurgia, Faculdade Medicina Veterinária e Zootecnia, USP, São Paulo, Brazil. https://orcid.org/0000-0001-6573-5612
Ii-sei Watanabe Departamento de Cirurgia, Faculdade Medicina Veterinária e Zootecnia, USP, São Paulo; Departamento de Anatomia, ICB III, USP, São Paulo, Brazil.
Adriano Polican Ciena | adriano.ciena@unesp.br Laboratório de Morfologia e Atividade Física– LAMAF, Universidade Estadual Paulista – UNESP, Rio Claro-SP, Brazil. https://orcid.org/0000-0002-2912-3376

Abstract

The present study aimed to describe the structural and ultrastructural morphological characteristics of the lingual epithelium and the connective tissue cores (CTCs) of wild boar (Sus scrofa). The tongues were processed for light microscopy, scanning electron microscopy, and transmission electron microscopy. In this study, we revealed the filiform, fungiform, foliate, and vallate papillae. The filiform papilla is elongated with a conical shape and its CTC has a conical shape; the fungiform papilla is rounded with a dome-shape and its CTC is flower bud; the foliate papilla is formed by four pairs of epithelial folds and irregular grooves, and its CTC is thin with adjacent conjunctive projections, and taste buds and serous glands in the epithelial layer have been evidenced; and the vallate papilla is oval surrounded by a groove with increases of epithelium surface, and the CTC is formed by numerous connective projections lined. Also noted were serous gland and taste buds on the medial wall of the vallate papilla. The epithelium has the keratinized, granular, spinous, basal, and lamina propria layers. In conclusion, we found new descriptions and shapes of the CTCs of the lingual papillae. In addition, we demonstrated the epithelium structural characteristics, the nuclear distribution between the epithelial layers, and the ultrastructural aspects of the dorsal epithelium of the tongue.