[Considerations about the origin levels of the cranial thyroid artery in guinea pig (Cavia porcellus)].

This paper deals with the stablishment of the origin of seven different levels of guinea pig cranial thyroid artery, based upon the cartilage of larynx and tracheal rings. Forty-five animals (females) from the Faculadade de Ciências Médicas e Biológicas de Botucatu, were anesthetized with chloroform, injected with contrasting substance in the thoracic aorta and dissected throught stereoscopic microscope. The results were expressed in relative percentage figures.