Arterial vascularization of the stomach, duodenum, pancreas, liver and spleen in Myocastor coypus (nutria) / Vascularização arterial do estômago, duodeno, pâncreas, fígado e baço em Myocastor coypus (nutria)

ABSTRACT

Background: Rodents are the largest group of mammals. The nutria is a middle-sized rodent, native to South America, raised for meet and fur. This study has the objective to systematize and describe the arterial vascularization of the stomach, duodenum, pancreas, liver and spleen of nutria (Myocastor coypus). Materials, Methods & Results: Thirty young and adult nutrias (15 females and 15 males) were used. Animals were administered 5000 IU heparin and after 30 min 20 mL of 12.5% sodium thiopental by intraperitoneal injection. Then, the thoracic cavity was ventrally opened, the thoracic aorta cannulated close to the diaphragm and the system was washed with saline solution. After, the system was filled with 603 latex colored in red and pieces were immersed in 20% formol for fixation for seven days. The abdominal cavity opened at the ventral median line, the branches of the abdominal aorta artery were dissected and, after the section of the main arterial trunks (celiac, caudal and cranial mesenteric arteries), the digestive tract was removed, sectioning the esophagus and rectus. Schematic drawings of all pieces were prepared with the use of a magnifying glass. The stomach, duodenum, pancreas, liver and spleen of the nutrias were exclusively irrigated by branches of the celiac and the cranial mesenteric arteries, visceral collateral first and second branches of the abdominal aort

RESUMO

Os roedores (ordem Rodentia) representam o mais numeroso grupo dentro da classe Mammalia. No Brasil, da família Capromyidae, registra-se a ocorrência apenas do gênero Myocastor, com uma única espécie vivente, o Myocastor coypus, conhecido como ratão do banhado, ou nutria. [...]