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Year 2018 - Volume 38, Number 1
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Morphogenesis of the rhea (Rhea americana) respiratory system in different embryonic and foetal stages, 38(1):154-166
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ABSTRACT.- Sousa R.P., Monteiro H.M.A., Bezerra D.O., Soares L.L.S., Assis Neto A.C., Rici R.E.G., Conde Junior A.M. & Carvalho M.A.M. 201,8. Morphogenesis of the rhea (Rhea americana) respiratory system in different embryonic and foetal stages. [Morfogênese do sistema respiratório da ema (Rhea americana) em diferentes estágios embrionários e fetais.] Pesquisa Veterinária Brasileira 38(1):154-166. Departamento de Morfofisiologia Veterinária, Centro de Ciências Agrícolas, Universidade Federal do Piauí, Campus Ministro Petronio Portela, Ininga, Teresina, PI 64049-550, Brazil. E-mail: mcelina@ufpi.edu.br
The rhea (Rhea americana) is an important wild species that has been highlighted in national and international livestock. This research aims to analyse embryo-foetal development in different phases of the respiratory system of rheas. Twenty-three embryos and foetuses were euthanized, fixed and dissected. Fragments of the respiratory system, including the nasal cavity, larynx, trachea, syrinx, bronchi and lungs, were collected and processed for studies using light and scanning electron microscopy. The nasal cavity presented cubic epithelium in the early stages of development. The larynx exhibited typical respiratory epithelium between 27 and 31 days. The trachea showed early formation of hyaline cartilage after 15 days. Syrinx in the mucous membrane of 18-day foetuses consisted of ciliated epithelium in the bronchial region. The main bronchi had ciliated epithelium with goblet cells in the syringeal region. In the lung, the parabronchial stage presented numerous parabronchi between 15 and 21 days. This study allowed the identification of normal events that occur during the development of the rhea respiratory system, an important model that has not previously been described. The information generated here will be useful for the diagnosis of pathologies that affect this organic system, aimed at improving captive production systems. |
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