Morfologia do funículo umbilical em ovinos deslanados mestiços (Ovis aries, L. 1758) | Morphology of the "funiculus umbilicalis" in wooless mongrel sheep (Ovis aries, L. 1758)

Aspectos anatômicos do funículo umbilical foram observados em 30 fetos de ovinos deslanados sem raça definida, retirados de fêmeas em diferentes estágios de prenhez, oriundas de matadouros do Estado de Pernambuco - Brasil. Em todas as observações constatamos a presença de um ducto alantóide, duas artérias e duas veias umbilicais, e em um único caso (gestação trigemelar) evidenciaram-se, no funículo umbilical, duas artérias e uma veia. À secção transversal do funículo umbilical na porção justafetal, cada conjunto de artéria e veia posicionava-se lateralmente ao ducto alantóide, ocupando diferentes planos, enquanto na porção média as veias tendiam para o mesmo plano das artérias, e, na porção justaplacentária, as veias lateralizavam-se em um só plano constituindo uma fileira de vasos. Obteve-se uma variação quanto ao comprimento do funículo de 5,0 a 21,5 centímetros com uma média igual a 12,24 centímetros em fetos com aproximadamente 2 a 5 meses de vida intra-uterina. Verificaram-se anastomoses arteriais no funículo umbilical (26,66%), sendo que 16,66% foram do tipo convergente 10% do tipo transversal.

Anatomical aspects of the umbilical cord of 30 unwoolly sheep in different stages of pregnancy, arising from Pernambuco State, were observed. It was verified single pregnancies (53.33%), and twin or triples pregnancies (46.66%). The material showed the presence of an allantoid duct, two arteries and two umbilical veins with a single exception, where were evidenced, in the umbilical funiculum female foetus, two arteries and one vein. By histological findings, obtained by transversal section of the umbilical funiculum, it was evidenced that the disposition of the vessels varied according to the sectioned portion. In the epsilateral foetal portion, each pack of artery and vein was positioned laterally to the allantoid duct occupying different planes. In the intermediary portion the veins tended to the same plane of the arteries and at the placenta epsilateral portion, the veins runned in only one plane making up one row of vessels. Was obtained a variation regarding to the funiculum length of 5.0 to 21.5 centimetre in length with an average of 12.24 centimetre in a foetus with approximately 2 to 5 months of intrauterine life. It was evidenced anastomosis (26.66%), 16.66% were of convergent type and 10% of transversal type.