Morphological aspects of atrioventricular valves in the ostrich (Struthio camelus)

Autores

  • Marcelo Abidu-Figueiredo Universidade Federal Rural do Rio de Janeiro
  • Clarice Machado Santos Federal University of Bahia, Avenida Reitor Miguel Calmon s/n, Vale do Canela, Salvado, BA, Brazil
  • Marco Aurélio Pereira Sampaio Fluminense Federal University, Rua Prof. Hernani de Mello 101- Niterói, RJ – Brazil.
  • Maurício Alves Chagas Fluminense Federal University, Rua Prof. Hernani de Mello 101- Niterói, RJ – Brazil.

DOI:

https://doi.org/10.5007/2175-7925.2013v26n4p203

Palavras-chave:

Anatomy, Atrioventricular valve, Histology, Ostrich

Resumo

Heart anatomy in the ostrich has been reported, but there are few information on the histological features of the atrioventricular valves. Hearts of young ostriches were fixed in 10% formaldehyde for 24 h and dissected to characterize their macroscopic anatomy. Samples of valves were harvested and stained with Mallory’s trichrome, Gomori’s trichrome, and Picro-Sirius red, for later analysis. The right atrioventricular valve consists of a muscle flap with two fixations. The left atrioventricular valve consists of two layers of endocardium with a layer of connective tissue between them. The free border of the tricuspid valve supports a varying number of chordae tendineae. One of the cusps is attached to the septum, while the other two cusps are attached to the opposite wall. The aortic valve, as well as the pulmonary trunk valve, consists of three cusps. The right atrioventricular valve showed up only as a muscle flap of myocardium coated with a thin layer of dense connective tissue, with two fixations. In the connective tissue, we find a predominance of type I collagen fibers and a lesser amount of type III, with a small presence of elastic fibers. The presence of Purkinje fibers were also usual in the valvular subendocardium, suggesting that they directly participate in the transmission of nervous stimulation to the muscle fibers within the valves. The left atrioventricular valve consisted of 3 cusps, a dorsal, a left, and a right.

 

Biografia do Autor

Marcelo Abidu-Figueiredo, Universidade Federal Rural do Rio de Janeiro

Possui graduação em Medicina Veterinária pela Universidade Federal Rural do Rio de Janeiro . Mestrado em Ciências Veterinárias pela Universidade Federal Rural do Rio de Janeiro , e Doutorado em Ciências pela Universidade do Estado do Rio de Janeiro . Atualmente é professor Adjunto de Anatomia Animal da Universidade Federal Rural do Rio de Janeiro. Tem experiência na área de Medicina Veterinária, com ênfase em Morfologia , atuando principalmente nos seguintes temas: Anatomia Animal e Comparada, Anatomia de Avestruz, Segmentos Anátomo-cirúrgicos Vasculares Viscerais em Vertebrados e Anatomia aplicada à prática cirúrgica, experimental e ao diagnóstico por imagem.

Clarice Machado Santos, Federal University of Bahia, Avenida Reitor Miguel Calmon s/n, Vale do Canela, Salvado, BA, Brazil

Animal and Comparative Histology Professor , Department of Biomorphology, Federal University of Bahia, Avenida Reitor Miguel Calmon s/n, Vale do Canela, Salvado, BA, Brazil

Marco Aurélio Pereira Sampaio, Fluminense Federal University, Rua Prof. Hernani de Mello 101- Niterói, RJ – Brazil.

Animal Anatomy Professor, Department of Morphology, Fluminense Federal University, Rua Prof. Hernani de Mello 101- Niterói, RJ – Brazil.

Maurício Alves Chagas, Fluminense Federal University, Rua Prof. Hernani de Mello 101- Niterói, RJ – Brazil.

Animal Histology Professor, Department of Morphology, Fluminense Federal University, Rua Prof. Hernani de Mello 101- Niterói, RJ – Brazil.

Publicado

2013-08-07

Edição

Seção

Artigos