Arterial vascular supply of the thymus in poultry (Gallus gallus domesticus) of the master gris cou plumé lineage

Para ampliar as informações sobre a morfologia comparativa, foram estudados, em aves (Gallus gallus domesticus) da linhagem Master Gris Cou Plumé, dados sobre o número de lobos tímicos, as origens, o número e a forma de distribuição das artérias que promoveram o suprimento sanguíneo deste órgão. Foram utilizadas 30 aves, 15 machos e 15 fêmeas, de aproximadamente seis semanas de idade, doadas, após morte natural, por criatórios do Distrito Federal. Os contingentes arteriais foram marcados com solução aquosa, a 50%, de Neoprene Látex “450”, corada com pigmento específico. Posteriormente, as aves foram fixadas e conservadas em solução aquosa, a 10%, de formaldeído, mediante aplicações intramusculares profundas, subcutâneas e intracavitárias e mantidas submersas na mesma solução. Foram encontrados de quatro a nove lobos tímicos cervicais e de um a dois lobos torácicos no antímero esquerdo; já no antímero direito, encontraram-se de três a sete lobos tímicos cervicais e de um a dois lobos torácicos. Verificou-se que os lobos tímicos foram supridos por ramos indiretos das artérias carótida comum, ingluvial, tireóidea caudal, tireóidea cranial, esofágica ascendente, comum do nervo vago e occipital, e ainda de ramos cutâneos. Foram supridos ainda por ramos diretos provindos das artérias ingluvial, tireóidea cranial e comum do nervo vago. Foi possível verificar que as aves desta linhagem apresentaram características próprias reforçadas ainda pelo fato das mesmas terem arranjos particulares para cada um dos indivíduos. _________________________________________________________________________________ ABSTRACT Seeking to expand information on the comparative morphology of poultry (Gallus gallus domesticus) of the Máster Gris Cou Plumé lineage, a study was conducted to provide data on the number of lobes of the thymus in addition to origin, number and distribution of the arteries that promoted the sanguineous supply of this organ. To this end 30 poultry (15 males and 15 females) were used. They were about six week old and were donated after natural death by poultry farms of the Federal District. The arterial supply was injected with a “450” Neoprene Latex stained solution. Subsequently, the poultry were fixed in a 10% formoldehyde aqueous solution by means of deep intramuscular, subcutaneous and intracaviteous applications and were kept in the same solution. Four to nine cervical lobes were found, in addition to one or two thoracic lobes on the left side. On the right side, three to seven cervical lobes and one or two thoracic lobes were found. The lobes were supplied indirectly by branches coming from the common carotidal artery, the cranial and caudal thyroidal arteries, the ascending esophageal artery, the ingluvial artery, the common vagus nerve artery, the occipital artery and the cutaneous branches. They were also supplied by direct by branches from the ingluvial artery, cranial thyroidal artery and common vagus nerve artery. It was possible to verify that poultry of this breed not only possessed characteristics that were defining for the breed as such, but also demonstrated particular arrangements for each of the individuals.