The morphological characteristics of nutria heart.
DOI:
https://doi.org/10.26641/1997-9665.2014.1.65-68Keywords:
heart, ontogenesis, nutria, ventricles, papillary-trabecular apparatus, cardiomyocytes, connective tissueAbstract
Background. The work considers morphological features of the nutria heart in postnatal ontogenesis: heart shape, internal relief of the chambers, papillary muscles, their shape, size and histological structure of the ventricular walls. Internal relief provides optimal process of ventricular contraction and relaxation. Formation of cardiac structure and structural features of cells reflect morphological structure and hemodynamic of the mature heart. Objective. To reveal the morphological features of the internal structure of a trabecular-papillary apparatus of nutria heart in postnatal ontogenesis. To determine the ratio of connective tissue to cardiomyocytes and structural patterns of internal trabecular-papillary apparatus of nutria heart, including the number, shape and size of papillary muscles in the right and left ventricles. Methods. As a material for the study we used 35 nutria hearts. Hearts were isolated and fixed in 10% neutral formalin. Morphometric methods were used: with the help of a ruler and a compass the size of the heart, thickness of the walls of right and left ventricles were measured. Histological sections were prepared in transverse and longitudinal plane with the further staining with hematoxylin. Calculation of cardiac index was performed by the formula: the ratio of the heart weight to the body weight. To determine the shape of the heart the ratio of the heart width to the body length was calculated. In value of the index up to 65% the heart shape was considered as conical, from 65% to 75% - ellipsoid, more than 75% - spherical. Results. Morphometric investigation showed that the nutria heart is globe-shaped (82%). The average cardiac index is - 0,4. The size of papillary muscles of a left ventricle prevails over the same parameter in the right ventricle. Nutria heart is characterized by a higher percentage of muscle tissue - 68.9%, while the percentage of connective tissue is - 31.1%. Conclusion. The structure and topography of papillary muscles of nutria heart demonstrated significant individual diversity of shape and quantity. The number of papillary muscles and tendon strings reflects the degree of fixation, which also depends on the size of muscles: the more massive papillary muscle – the higher degree of fixing it has. The percentage of muscle tissue in myocardium depends on the activity of the animal.
References
- Borovikov VP, Borovikov IP. [Statistica: Statistical analysis and data processing in the Windows environment]. 1st ed. Moscow: Informatsionno-izdatelskiy dom ‘Filin’; 1997. 608 p. Russian.
- Gutsol AA, Kondratiev BYu, authors; Avtandilov AA, editor. [Practical morphometry of organs and tissues]. Tomsk: Tomsk state university; 1988. 133 p. Russian.
- Zavaleieva SM. [Comparative morphology of myocardium in Vertebrates] [doctoral dissartation’s synopsis]. Moscow; 1996. 35 p. Russian.
- Lapach SN, Chubenko AV, Babich PN. [Statistical methods in biomedical research using Excel]. Kyiv: MORION; 2000. 320 p. Russian.
- Naumov SP. [Zoology of Vertebrates: text-book]. Moscow: Vysshaia shkola; 1982. 464 p. Russian.
Downloads
How to Cite
Issue
Section
License
Copyright (c) 2018 Morphologia
This work is licensed under a Creative Commons Attribution 4.0 International License.
The authors reserve the right to authorship of their work and transfer to the Journal the right to the first publication of this work under the terms of a license Creative commons Attribution 4.0 International (CC BY 4.0), which allows other people to freely distribute the published work with a mandatory reference to the authors of the original work and the first publication of the work in this journal.By submitting a manuscript to the editorial office of the Journal ‘Morphologia’ authors agree to transfer the rights to protect and use the manuscript (all supplemental materials, particularly protected objects such as photos, drawings, diagrams, tables, etc.), including the reproduction in the press and distribution via the Internet; translation of the manuscript into any language; export and import of journal copies with the Authors’ article in order to make it available for public. Authors convey the rights mentioned above to the editorial office without any temporal or territorial limitation all over the world.
The Authors guarantee that they have the exclusive rights to use the material transferred to editorial office. Editors are not responsible to third parties for contraventions of warranty given by the Authors. The considered rights are transferred to the editorial office since the moment when the current issue is signed for publishing. Reproduction of materials published in the Journal by other individuals and legal entities is possible only with the consent of Editorial office, with the obligatory indication of the full bibliographic reference of the primary publication. The Authors reserve the right to use the published material, its fragments and parts for teaching materials, oral presentations, dissertation thesis prepararion with obligatory bibliographic citation of the original paper. Electron copy of the published article, downloaded from official journal web-site in .pdf format may be put by authors on the official web-site of their institutions, any other official resources with open access.
