Macroscopic Anatomy of the Heart of the Ringed Seal (<i>Phoca hispida</i>)

Smodlaka, Hrvoje; Henry, Robert W.; Schumacher, Juergen; Reed, Robert B.

doi:10.1111/j.1439-0264.2007.00791.x

Cited by 21 publications

(30 citation statements)

References 16 publications

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“…A diferença entre altura ventricular e largura do eixo crânio-caudal foi de 2,0-1,0cm, sendo semelhante ao relatado por Bisaillon (1982) no coração da focada-groenlândia (Pagophilus groenlandicus) e por Smodlaka et al (2007) que no coração da foca-anelada (Phoca híspida) relataram que a altura ventricular foi 12,6…”

Section: Microscopia Eletrônica De Transmissãounclassified

“…Com relação aos resultados macroscópicos o coração do Arctocephalus australis corresponde às descrições feitas para outros mamíferos marinhos (SLIJPER, 1968;DRABEK, 1975;ROWLATT, 1981;BISAILLON, 1982;BISAILLON et al, 1987;STEWARDSON et al,1999;SMODLAKA et al, 2007). O coração é envolvido completamente pelo pericárdio, e possui quatro cavidades, sendo dois átrios e dois ventrículos, assim como relatado para outros mamíferos terrestres e aquáticos (STEWARDSON et al,1999;DYCE et al, 2004;KONIG;LIEBICH, 2004;SMODLAKA et al, 2007).…”

Section: Microscopia Eletrônica De Transmissãounclassified

“…O coração é envolvido completamente pelo pericárdio, e possui quatro cavidades, sendo dois átrios e dois ventrículos, assim como relatado para outros mamíferos terrestres e aquáticos (STEWARDSON et al,1999;DYCE et al, 2004;KONIG;LIEBICH, 2004;SMODLAKA et al, 2007).…”

Section: Microscopia Eletrônica De Transmissãounclassified

“…Em nossa pesquisa, verificou-se que, entre a origem do arco aórtico e a formação do tronco braquiocefálico, existe o bulbo aórtico do lobo-marinho-do-sul com diâmetro visivelmente maior em relação à aorta descendente. O mesmo foi encontrado por outros autores em espécies de cetáceos e pinípedes (leões-marinhos) (ELSNER et al, 1966;ELSNER, 1969;DRABEK, 1975;STEWARDSON et al, 1999;BURNS, 2002 ROWLATT, 1990, EVANS, 1993BULL;MARTINS, 2002;HENRY et al, 2005;VLASOVA, 2005;GARRI, 2006;SMODLAKA et al, 2007).…”

Section: Microscopia Eletrônica De Transmissãounclassified

“…Em nossos estudos pudemos observar que o ramo interventricular subsinuoso tem origem da artéria coronária direita, como mencionado por van Nie (1985) em 95% dos corações estudados da Phoca vitulina vitulina (foca-comum) e ao contrário dos relatados em cães domésticos (EVANS, 1993) e na foca-anelada-do-ártico (Phoca híspida) (SMODLAKA et al, 2007) nos quais o ramo interventricular subsinuoso tem origem do ramo circunflexo da artéria coronária esquerda.…”

Section: Microscopia Eletrônica De Transmissãounclassified

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Análise Morfológica e Ultra-estrutural do Coração do Lobo-Marinho-do-Sul (Arctocephus australis, Zimmermann, 1783)

Guimarães¹

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funcionamento geral dos demais sistemas corpóreos, este trabalho teve por objetivo descrever a morfologia e aspectos morfométricos do coração a fim de estabelecer comparações entre o coração do lobo-marinho-do-sul com outros pinípedes e carnívoros terrestres. Para tanto, foram utilizados corações de lobo-marinho-do-sul (Arctocephalus australis) que vierem a óbito por causas naturais. Após análise macroscópica e realização de mensurações, os corações foram analisados em nível de microscopia de luz, microscopia eletrônica de varredura, por meio de crio fratura em nitrogênio líquido, e microscopia eletrônica de transmissão. As características topográficas e morfológicas do coração do lobo-marinho-do-sul são descritas. O órgão é quase totalmente envolto pelo pulmão e revestido pelo pericárdio tendo uma forma alongada e achatada. Os aspectos ultra-estruturais apresentaram a disposição de fibras musculares dos átrios e ventrículos com as características típicas de fibras cardíacas revelando os feixes de miofibrilas, mitocôndrias com as cristas mitocondriais nítidas, junções em forma de placas, anastosmoses entre os feixes de miofibrilas e grânulos elétron-densos, nátrio-uréticos, próximo ao núcleo das células musculares ou ao longo da disposição de mitocôndrias das fibras musculares de átrios.Palavras-chave: Lobo-Marinho-do-Sul. Coração. Fibras musculares. Mitocôndria. The southern-fur-seal belongs to the order Carnivora, suborder Pinnipedia and Otariidae family lives in aquatic and terrestrial environments and thus presenting important adaptive morpho-physiological changes, between then the cardiovascular system. The heart is the central muscular organ of the circulatory system whose function is to transport oxygen and nutrients to tissues, as well as the transport of carbon dioxide. Considering the importance of this organ to the overall functioning of other body systems, this study was to aim to describe the morphology and morphometric aspects of the heart in order to establish comparisons between the heart of the southern-fur-seals with other pinnipeds and terrestrial carnivores.Therefore, hearts of southern-fur-seals (Arctocephalus australis) were used that come to death by natural pathologies. After macroscopic analysis and execution of measurements, the hearts were analyzed at the level of light microscopy, scanning electron microscopy, using cryo fracture in liquid nitrogen, and transmission electron microscopy. The heart of the fur seal-of-south is surrounded almost entirely by the lung and covered by the pericardium, having long, flat in shape. The ultrastructural aspects presented the dispositive of muscle fibers of the atrium and ventricles under the typical cardiac fibers revelry the myofibrils bundles, mitochondria with mitochondrial cristal, junction in form of plates, anastomosis between the myofibrils bundles, and electron dense granules like natriun-uretriz near to nuclear of muscle cells or along the disposal of mitochondria of the muscle fibers of atrium.

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Section: Microscopia Eletrônica De Transmissãounclassified

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Análise Morfológica e Ultra-estrutural do Coração do Lobo-Marinho-do-Sul (Arctocephus australis, Zimmermann, 1783)

Guimarães¹

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Coronary anatomy in neotropical carnivores: A comparative analysis

Viotto‐Souza,

Santos,

Abidu‐Figueiredo

et al. 2023

The Anatomical Record

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This study aims to investigate the anatomy of coronary arteries and their primary branches in neotropical carnivores, given the functional significance of coronary circulation and the limited existing descriptions in this order. For this purpose, coronary arteries were dissected, and their branches were counted in 74 hearts from 20 species belonging to five families: Canidae, Mustelidae, Procyonidae, Mephitidae, and Felidae. In all specimens of the suborder Caniformia, the subsinuosal interventricular branch originated at the end of the circumflex branch of the left coronary artery (LCA). In contrast, in all hearts of Felidae specimens, the subsinuosal branch was derived from the right coronary artery. Among the 50 neotropical specimens of the suborder Caniformia, 13.1 ± 5.2 ventricular branches originated from the LCA and only 4.6 ± 1.4 from the right (p < 0.0001), characterizing a consistent left dominance. However, in the 24 specimens of the Felidae family, 10.5 ± 4.0 ventricular branches were found originating from the LCA and 10.4 ± 3.4 from the right, with no difference between the means (p = 0.82), defining a balanced pattern. It is suggested that the type of coronary circulation may correlate with the phylogeny of carnivorans.

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Gross Anatomy of the Ringed Seal (Pusa hispida) Gastro-Intestinal Tract

Smodlaka

Henry

2013

Anat. Histol. Embryol.

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The gross anatomical structure of the ringed seal (Pusa hispida) gastrointestinal tract is poorly described and often veterinary anatomical terminology is not used. Although the basic abdominal visceral pattern corresponded to domestic carnivores, significant differences were noted. The stomach was an elongated sharply bent tube (u-shaped) with the pylorus and fundus juxtaposed. The elongated jejunum measured up to 15.6 times body length and had 37 jejunal arteries from the cranial mesenteric artery. The pancreas was asymmetrical with a small right lobe and a large left lobe. The unusually short greater omentum negated formation of deep and superficial leaves. The most remarkable difference was the separation of the liver parenchyma into three physically separate masses, held together by hepatic ducts, veins and arteries. The topography and position of the liver was dependent on the amount of blood in the hepatic sinus (distended hepatic veins and hepatic portion of vena cava). Thus, as the hepatic sinus filled, the lateral liver masses separate from the central mass by moving caudolaterally. This was facilitated by modified coronary and triangular ligaments which did not attach directly to the liver, but instead to the hepatic sinus. These anatomical adaptations are apparently advantageous to ringed seal's survival in a deep marine environment.

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Macroscopic Anatomy of the Heart of the Ringed Seal (Phoca hispida)

Cited by 21 publications

References 16 publications

Análise Morfológica e Ultra-estrutural do Coração do Lobo-Marinho-do-Sul (Arctocephus australis, Zimmermann, 1783)

Análise Morfológica e Ultra-estrutural do Coração do Lobo-Marinho-do-Sul (Arctocephus australis, Zimmermann, 1783)

Coronary anatomy in neotropical carnivores: A comparative analysis

Gross Anatomy of the Ringed Seal (Pusa hispida) Gastro-Intestinal Tract

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