Topographical and morphological analysis and vascularization of the thyroid gland of the dogs (Canis familiaris)

Abstract

ABSTRACT. Rodrigues A.B.F., Costa N.Q., de Aguiar R.R., Di Filippo P.A. & de Almeida A.J. [Topographical and morphological analysis and vascularization of the thyroid gland of the dogs (Canis familiaris).] Análise morfológica, topográfica e vascularização da glândula tireóide em cães (Canis familiaris). Revista Brasileira de Medicina Veterinária, 38(3):316-322, 2016. Seção de Anatomia Animal, Laboratório de Morfologia Patologia Animal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Avenida Alberto Lamego, 2000, Parque California, Campos dos Goytacazes, RJ 28013-602, Brasil. E-mail: [email protected] Divergent data related to the metric parametric thyroid gland in dog served as a stimulus for this work which aims to define the morphological, topographical and blood supply of the thyroid gland patterns, using the methodology the description of morphology and topography of the gland in situ. Of the 48 dead dogs analyzed, males and females, SRD, aged 1 to 14 years and body weight of 1.5kg to 22Kg was possible to identify a gland consists of two lobes, oval, elongated and dark brown coloring, located dorsolaterally right and left of the tracheal rings. In most animals, the right lobes (52.1%) and left (58.3%) were positioned between 1 and 10 tracheal rings. No significant differences were observed between the morphometric average of thyroid lobes compared by t-test at 5% probability. Both lobes received nutrition, in most cases, the cranial thyroid artery. Both lobes received nutrition, in most cases, of the cranial thyroid artery. This irrigated directly from the right and left lobes with only one major vessel in 100% of cases. The main vessel was subdivided into up to 6 small branches that penetrated the thyroid gland. Likewise the caudal thyroid artery flow to the caudal pole of the gland with the main vessel, suffering subdivisions in small branches (1-3). It was possible to identify a positive correlation between the animal’s weight and length of the gland and between the animal’s weight and the weight of the gland. It was also found that both lobes were supplied by direct branches of the common carotid artery presenting as cranial and caudal thyroid artery.