Structural adaption of the nasal conchae of Eurasian common moorhen (Gallinula chloropus chloropus, Linnaeus, 1758)—Histomorphological study

Abstract

In the current study, the nasal conchae of the Eurasian common moorhen were grossly and histologically examined for 20 healthy adult birds. Rostral (RC), middle (MC), and caudal (CC) conchae in each side of the nasal cavity were observed. The anatomical cross sections revealed that, the RC was noncurved in its rostral and middle parts, and one half turn in its caudal part. The MC was one half turn in its rostral part, one turn in its middle part, and one and one half turns in its caudal part. The CC was like a pouch from the lateral wall of the nasal cavity. Histologically, the distribution of the mucous glands was different among the three conchae; In RC, the ducts of these glands were intraepithelial, while the acini were located in the propria–submucosa toward the convex surface of the concha and absent toward its concave surface. In MC, they were intraepithelial and opened directly on the surface epithelium of the convex and concave surfaces. In CC, they were intraepithelial in few number near the convex surface of the concha and with abundant number in the propria–submucosa and absent near the concave surface. The RC was richer in the vascularity than the other two conchae. The nasal conchae were functioning for conditioning of the inspired air and entrapping the antigens presented in it.

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“…However, the anterior segment ( Fig. 8 B), showed no histopathological alteration which could be clarified by the fact that the anterior region of the nasal mucosa is the thicker part of the nasal mucosa with thick keratinized stratified squamous epithelium lining which becomes thinner non-keratinized pseudostratified ciliated columnar respiratory epithelium gradually as we go towards the posterior region ( Gao et al, 2020 ; Gewaily and Abumandour, 2021 ; Hanafy, 2021 ; Pathak and Rajput, 2018 ). This gave some sort of protection to the anterior segment against the damaging effect of isopropyl alcohol.…”