Topografia, morfologia, biometria e artérias do timo em aves domésticas (Gallus gallus domesticus) da linhagem Ross 308 AP (AP95)

Abstract

The productive chains of chicken meat and eggs have been highlighted as supply of protein of animal origin to world population and the anatomical and functional knowledge of these animals is fundamental for understanding of how these beings are organized to maintain animal health. The objective of this study was to know the topography, morphometry and thymic arteries in domestic Ross 308 AP (AP95) lineage birds, in 15 males and 15 females, with an approximate age 15 weeks and a mean weight of 2.1 kg for males and 1.7 for females. After injection of 450 neoprene stained in its arterial vessels, through right ischemic artery and posterior fixation in 10 % formalina aqueous solution, the pieces were dissected. The thymus lobes are located from the cranial third of neck to clavicular bones, linearly parallel and laterally in neck, in intimate relationship with vagus nerve, external jugular vein and common vagus nerve artery. The thymic lobes have varied shapes of light pink coloration. The number varies from four to eight, averages from 4.87 to 5.47. Grouping the thymic lobes according to location in neck in third: cranial, middle or caudal. The averages of length x widths x thickness in mm vary from 0.98 to 23.15 the widths, from 1.93 to 52.1 the lengths and 0.32 to 8.52 the thicknesses. The right and left thymic lobes are irrigated in all cases by branches from the arteries: common vagus nerves, common cutaneous branches vagus nerve, ascending cutaneous cervical, cranial and caudal thyroids, ingluvial, vague-vertebral trunk and ascending esophageal of corresponding antimeres, and those of right also receive branches of vertebral and subclavian arteries. The thymus of right antimer receives from 13.73 to 14.07 branches and the left from 12.08 to 13.08.