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1.
Rev. bras. ciênc. vet ; 17(2): 83-86, 20100000. graf
Article in Portuguese | LILACS, VETINDEX | ID: biblio-1491413

ABSTRACT

O objetivo foi descrever pela primeira vez o corpo lúteo cavitário gestacional em Sotalia guianensis, espécie de golfinhocosteiro que se distribui ao longo da costa Atlântica Ocidental. Os ovários de um espécime com 196cm de comprimentocorporal, com 9,2 meses de gestação, capturado acidentalmente durante atividade pesqueira na costa norte do estado doRio de Janeiro. O material foi avaliado morfologicamente e processado para cortes em parafina, corado pela hematoxilina eeosina para microscopia. O ovário direito apresentava forma amendoada, com sulcos em uma lateral, três folículos e umcorpo lúteo polar em involução. O ovário esquerdo pesava sete vezes mais que o direito. A superfície era enrugada, com umfolículo, seis corpos lúteos e quatro albicans. O maior corpo lúteo era protruso, com diâmetro médio de 3cm e uma cavidadecentral de 1cm de diâmetro, revestida por paredes regulares e espessas, sugerindo ser um corpo lúteo em desenvolvimento.Os outros corpos lúteos eram maciços e estavam em regressão. A microscopia do corpo lúteo não demonstrou envolvimentopatológico. Esta descrição, ímpar na espécie, representa uma contribuição ao conhecimento da biologia (reprodutiva) da S.guianensis, que consta como "Dados Deficientes" na lista vermelha da União Internacional para Conservação da Natureza.


This is the first study to describe the corpus luteum with central cavity during pregnancy in Sotalia guianensis, a coastal dolphin species distributed along the Atlantic Ocean coast. The material analyzed was a pair of ovaries of a 196-cm-long female was 9.2 months pregnant, accidentally captured on the north coast of the state of Rio de Janeiro, Brazil. Both ovaries were measured and inspected for anatomic structures. After, ovaries were process in paraffin-embedded and stained with hematoxylin and eosin for microscopy. The left ovary had a wrinkled outside, one follicle, six corpora lutea and four corpora albicans. The largest corpus luteum was protruded, 3 cm long in mean diameter with one central cavity. It was lined by uniform thick walls and peripheral vascularization, which suggests that the corpus luteum is under development. The left ovary was deformed due to the presence of corpus luteum, which accounted for the seven-fold higher weight as compared to the right ovary. The histology of the corpus luteum did not evince any pathologic status of the material. This description, the first ever made for the species, offers a contribution to the existing knowledge about the reproduction biology of S. guianensis, which is a member of the "Insufficient Data" Red List prepared by the World Conservation Union.


Subject(s)
Animals , Corpus Luteum/anatomy & histology , Dolphins/anatomy & histology , Dolphins/embryology
2.
Int. j. morphol ; 24(3): 351-356, sept. 2006. ilus
Article in Spanish | LILACS | ID: lil-474596

ABSTRACT

El objetivo de este estudio fue describir la conformación interna y externa y la irrigación del corazón del delfín franciscana de la Plata (Pontoporia blainvillei) para lo cual fueron disecados 12 corazones. El pericardio se fijaba caudalmente al diafragma, ventralmente al músculo transverso torácico y, lateralmente, a las costillas y músculos intercostales. El corazón era aplastado dorsoventralmente, su base era craneal, su ápex era compartido por ambos ventrículos. El ventrículo izquierdo era de pared gruesa, mientras que la del ventrículo derecho más delgada y depresible. La cara ventral correspondía a la cara auricular y la cara dorsal a la cara atrial de la Nomina Anatomica Veterinaria, 2005 (NAV). En la conformación interior del atrio derecho destacaba el gran desarrollo de la cresta terminal y de la fosa oval. Dentro del ventrículo derecho, los músculos papilares se distribuían en subbarterioso, magnus y parvi. Una trabécula septomarginal se extendía entre los músculos papilares subarterioso y magnus. También fueron observadas trabéculas menores del mismo tipo, situadas más ventralmente a la anterior. Las venas pulmonares se unían en un tronco común antes de llegar al atrio izquierdo. El ventrículo izquierdo tenía dos músculos papilares bien desarrollados. La irrigación cardíaca arterial mostraba un predominio de la arteria coronaria izquierda y se notaba la presencia de anastomosis intercoronarias.


The aim of this study is to describe the external and internal conformation and the arterial irrigation of La Plata Dolphin's heart (Pontoporia blainvillei). Twelve animals obtained from nets of fishing ships were used and their hearts were studied by means of simple dissection. The pericardium was fixed caudally to the diaphragm, ventrally to the thoracic transverse muscle and laterally to the ribs and intercostal muscles. The heart weighted about 115 grams, was flattened dorsoventrally, its base was cranial, its apex was shared by both ventricles. The ventral face corresponds to the auricular face of the Nomina Anatomica Veterinaria (NAV), and the dorsal face corresponds to the atrial face. In the internal conformation of the right atrium the great development of the crista terminalis and the fossa ovalis stood out. Inside the right ventricle the papillaris muscles were observed distributed in subarteriosus, magnus and parvi. The dextra septomarginal trabecules were multiple and situated between the papillaris muscles. In the left ventricle they had two well developed papillaris muscles. The left coronary artery is the most important vessel in the arterial irrigation of the cardiac territory.


Subject(s)
Animals , Heart/anatomy & histology , Heart/growth & development , Coronary Vessels/anatomy & histology , Coronary Vessels/embryology , Dolphins/anatomy & histology , Dolphins/embryology , Uruguay/ethnology
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