Sistematização e descrição da vascularização arterial da área páleo-palial na superfície do cérebro de chinchila (Chinchilla lanigera)
Araújo, Ana Cristina Pacheco deCampos, Rui
Background: Chinchilla (Chinchilla lanigera) is a small rodent that in recent years has been increasingly used as a laboratory animal by different researchers. Brain irrigation is the object of study by several authors, being chinchilla classifiedas a vertebrobasillary animal, that is, it does not depend on the internal carotid artery to originate its cerebral arterialvascularization. Thus, the objective of this study was to systematize and describe the branches of the rostral, middle andcaudal cerebral arteries that vascularized the paleopallia area of the chinchilla.Materials, Methods & Results: Thirty Chinchilla lanigera brains were used in this study, 17 females and 13 adult malesfrom farms in the municipalities of Viamão and Santa Maria in the state of Rio Grande do Sul, Brazil. The animals wereheparinized, with 5000 IU / animal, and after 30 min were sacrificed with 8 mL / 2.5% sodium thiopental animal, bothintraperitoneally. The thoracic cavity was opened, the cardiac apex sectioned and the aortic arch was cannulated throughthe left ventricle. The arterial system was flushed with 0.9% cooled saline, 100mL / animal and then filled with 603 latexstained red with specific dye. The skin was recessed and a bone window opened in the cranial vault. Thus the pieces werefixed in 20% formaldehyde for seven days and after this period, the brain with a cervical spinal cord segment was removedand ventral schematic drawings of all preparations were prepared. The Veterinary Anatomical Nomina (2017) was usedto name the cerebral arteries and their branches and for the statistical analysis of the results, the percentage calculationwas applied. Brain irrigation in the chinchilla was supplied by the basilar artery, which was formed by anastomosis of theterminal branches of the right and left vertebral arteries, in the most caudal portion of the oblong medulla. The paleopalliaareas corresponded to the olfactory trine, lateral brain fossa, piriform lobe...(AU)
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