Publication:
Cotton rats (Sigmodon hispidus) possess pharyngeal pouch remnants originating from different primordia

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Nakamura-33-555-565-2018.pdf(10.1 MB)
Date
2018
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Authors
Nakamura, Teppei ; Ichii, Osamu ; Irie, Takao ; Mizoguchi, Tatsuya ; Shinohara, Akio ; Kouguchi, Hirokazu ; Sunden, Yuji ; Otsuka Kanazawa, Saori ; Ali Elewa, Yaser Hosny ; Koshimoto, Chihiro ; Nagasaki, Ken Ichi ; Kon, Yasuhiro
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Publisher
Universidad de Murcia. Departamento de BiologĂ­a Celular e HistologĂ­a
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DOI
DOI: 10.14670/HH-11-946
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info:eu-repo/semantics/article
Description
Abstract
Pharyngeal pouches in mammals develop into specific derivatives. If the differentiation of the pharyngeal pouches is anomalous, their remnants can result in cysts, sinuses, and fistulae in the differentiated organs or around the neck. In the present study, we found several pharyngeal pouch remnants, such as cystic structures in thymus and parathyroid gland and fossulae extended from the piriform fossa, in the inbred cotton rats maintained at Hokkaido Institute of Public Health (HIS/Hiph) and University of Miyazaki (HIS/Mz). In HIS/Hiph, the fossulae extended from the apex of the piriform fossa into the thyroid glands and were lined with stratified squamous and cuboidal epithelium. Calcitonin-positive C-cells were present within their epithelium in HIS/Hiph. In contrast, the fossulae of HIS/Mz ran outside the thyroid glands toward the parathyroid glands; they were lined with columnar ciliated epithelium and a few goblet cells, but had no Ccells, which was consistent with the cystic structures in the thymus and the parathyroid gland. These results indicated that the fossulae were a remnant of the ultimobranchial body in HIS/Hiph and of the thymopharyngeal duct in HIS/Mz. Thus, the fossulae of the piriform fossa resembled the piriform sinus fistula in human. In conclusion, cotton rats frequently possessed pharyngeal pouch remnants, including the piriform sinus fistula, and therefore, might serve as a novel model to elucidate the mechanisms of pharyngeal pouch development.
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Cotton rat , Pharyngeal pouch remnant , Thymopharyngeal duct , Ultimobranchial body , Piriform sinus fistula
Citation
Histology and Histopathology, Vol.33, nÂş6, (2018)
URI
http://hdl.handle.net/10201/119092
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Histology and histopathology Vol.33, nÂş6 (2018)
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