Veias do sistema porta-hepático em gansos domésticos

Abstract

RESUMO.-A distribuição intraparenquimal das veias porta-hepáticas foi estudada em 30 gansos domésticos. Latex Neoprene corado foi injetado pela veia isquiática e os animais forma fixados por imersão e injeção intramuscular com formol a 10% e dissecados. O fígado esteve composto por um grande lobo hepático direito e por um lobo hepático esquerdo menor, os quais estiveram conectados por uma ponte de parênquima. O lobo direito do fígado teve exclusivamente vasos do sistema porta-hepático formados pela distribuição intraparenquimal da veia portahepática direita, enquanto que no lobo esquerdo estes originaram-se da veia porta-hepática direita e de pequenas veias porta-hepáticas esquerdas. A veia porta-hepá-tica direita emitiu o ramo caudal direito, que emitiu um pequeno ramo caudolateral direito e um grande ramo caudomedial direito. Cranialmente esta veia emitiu os ramos craniais direito e ramos lateral direito. A porção transversa da veia porta-hepática direita cruzou para o lobo hepático esquerdo, emitindo de 1 a 6 pequenos ramos craniais e caudais para a região média do fígado. No lobo esquerdo, o ramo esquerdo da veia porta-hepática direita emitiu o ramo cranial esquerdo, o ramo lateral esquerdo e The intraparenchymal distribution of the hepatic portal veins in 30 domestic geese were studied. Stained Neoprene latex was injected into the isquiatic vessels, and the animals were fixed in 10% formaldehyde by immersion and intramuscular injection. The liver of geese was composed of a large right and a smaller left hepatic lobe, connected by a parenchyma bridge. The right hepatic lobe had vessels exclusively from the hepatic portal system composed by intraparenchymal distribution of the right hepatic portal vein, while the vessels of the left hepatic lobe came from the right hepatic portal vein and from small left hepatic portal veins. The right hepatic portal vein emitted the right caudal branch, which emitted a small right caudolateral branch and a large right caudomedial branch. Cranially this vein emitted right cranial and right lateral branches. The tranverse portion of the right hepatic portal vein crossed to the left hepatic lobe, emitting 1 to 6 small cranial and caudal branches to the medial area of the liver. In the left hepatic lobe, the left branch from the right hepatic vein emitted the left cranial, left lateral and left median branches. One to six left hepatic portal veins were identified arising from the left branch or from the transverse portion of the right hepatic portal vein. These vessels arose from the gizzard and proventricle. In 40% of geese one proper hepatic portal vein originated from venous vessels of the gizzard and was distributed into the caudal extremity of the left hepatic isolated lobe.INDEX TERMS: Morphology, hepatic portal vein, liver, geese.

Descriptive Anatomy of Hepatic and Portal Veins with Special Reference to Biliary Duct System in Broiler Chickens (Gallus gallus domesticus): A Recent Illustration

“…Our investigations in the present study confirmed the results of Purton (1969) in domestic fowl, Miyaki (1978) in fowl and Santos et al (2009) in domestic geese that the intrahepatic right portal vein shortly divided into two large right and left branches. The right branch divided into dorsal, middle and ventral branches within the right hepatic lobe while the left branch directed medially toward the left hepatic lobe giving dorsal and ventral median branches and terminated in the left lobe by anastomosing with the left hepatic portal vein through a terminal branch.…”

“…Our investigations revealed that the hepatic portal drainage of fowl was constituted by two large hepatic veins, right and left which was in accordance with the observations of Oliveira (1959) and Malinovsky (1965) in gallus Nickel et al (1977) in birds, Pinto et al (1999) in duck, Santos et al (2009) in geese, El karmoty (2014) in ducks and geese and Tolba (2015) in common domestic pigeons. The present investigation was not similar to that reported by Oliveira (1959) and Malinovsky (1965) in gallus who reported that the ventral and left gastric veins with the caudal proventricular vein fused to form the left hepatic portal vein, and of Pinto et al (1999) in duck who asserted that it formed by one or two left gastric veins, and of El karmoty (2014) in ducks and geese and Tolba (2015) in pigeon who confirmed that only two veins forming the left hepatic portal vein, the ventral proventricular and the left gastric veins.…”

“…The constitution of the left hepatic portal vein in the current study was the same in all dissected chickens which differed than that reported by Santos et al (2009) in domestic geese that the tributaries of the left hepatic portal vein were varied as 1, 2, 3, 4, 5 and 6 in five, three, eight, eight, three and two geese respectively.…”

Morphology of liver and portal-hepatic system in Trachemys scripta elegans (Testudinata)

“…observaram Nishida et al (1969), Baumel (1986) e Santos et al (2009), em aves, que são aparentados com os cágados estudados.…”