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A vascularização arterial do timo (número, origem e ordenação) bem como a distribuição parenquimal dos ramos penetrantes foram estudadas em 40 aves da linhagem Paraíso Pedrês. Trinta aves foram injetadas com látex e dissecadas, enquanto 10 aves tiveram seus sistemas arteriais injetados com resina (metil metacrilato e mercox) para a preparação de moldes vasculares. A principal fonte de irrigação encontrada foi a associação dos ramos oriundos das artérias comuns do nervo vago, tireóideas e ingluviais, sendo que seus ramos penetravam o parênquima dos lobos, principalmente pelas suas extremidades cranial e caudal. A partir da penetração, os ramos tímicos apresentavam distribuição predominante para a periferia do lobo, formando uma trama capilar poligonal, com espaços irregulares, característica de um órgão linforreticular.  ABSTRACTThe thymus arterial vascularization (number, origin and organization) as well as the parenchymal distribution of the penetrative branches were studied in 40 birds of Paraiso Pedres lineage birds. From this total, 30 were injected with latex and dissected, while 10 had their arterial vessels injected with resin (methylmethacrylate and mercox) for the vascular matrix preparation. The main source of irrigation found was the association of branches originated from the common arteries of the vago nerve, thyroid and ingluvial, and their branches penetrated in the parenchyma of the lobes especially through the caudal and cranial endings. From this penetration, the thymic branches showed most of their distribution to the lobe periphery, creating a polygonal capilar web with irregular, spaces which is a characteristic of a linforeticular organ

Irrigação do timo em aves da linhagem Paraíso Pedrês (Gallus gallus domesticus)