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SUMMARY : The objective of this study is to describe the cranial and caudal mesenteric arteries in 10 opossuns after Neoprenelatex injection. The cranial mesenteric artery arises from the abdominal aorta, caudally to the celiac trunk, originating the caudal duodenalpancreatic artery, middle and right colic, jejunal and ileocecocolic arteries. The caudal mesenteric artery arises from the aorta, craniallyto the external iliac arteries, originating the cranial rectal and left colic arteries. KEY WORDS: Anatomy; Opossum; Mesenteric arteries. INTRODUCTION Considering that the anatomical knowledge is necessary tounderstand the biological functions, a macroscopic study on thecranial and caudal mesenteric arteries was carried out, aiming atincreasing the anatomy knowledge compared with other animals.Studies with rats carried out by Greene (1955), Farris &Griffith (1949) and Cook (1965) stated that in these animals th eupper mesenteric artery is a great vessel that comes from theaorta abdominal portion, originating a lower pancreatic-duodena lbranch which extends to the pancreas and duodenum and severalbranches to the jejunum and ileum, cecum and colon.Barone

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:21:56Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:34:47Z : No. of bitstreams: 1 2-s2.0-33746608511.pdf: 460835 bytes, checksum: 596ccfea0636f0deea5caaf2f583dbb8 (MD5) Made available in DSpace on 2014-05-27T11:21:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-08-07 Light microscopy analysis of the mural structure of the common carotid artery, internal carotid artery and external carotid artery in mongrel dog revealed variability in the middle values of vascular diameter and thickness of the intimal plus medial coats and adventitial coat. The vascular diameter did not differ between the internal carotid artery and external carotid artery, but was significantly increased in the common carotid artery from which the other two arteries had origin. The increased thickness of the intimal plus medial coats of the common carotid artery revealed the constant mechanical adjustment of the arterial wall and local shearing stress that occurred among the arterial coats. The adventitial coat of the internal carotid artery was significantly thicker than those of the common carotid and external carotid arteries, with no significant difference noted between the latter arteries. These histomorphometric results were related to the qualitative observations regarding the mural structure of the three arteries analyzed, especially regarding to the increased thickness and structural complexity of the adventitial coat of the internal carotid artery. Perhaps it acted as an external protective sheath of the vascular wall during its long course until the carotid channel. © 2006 Sociedad Chilena de Anatomía. Departamento de Anatomia/UNESP, Campus de Botucatu, SP Setor de Anatomia/Faculdade de Medicina e Enfermagem - UNIMAR, Campus de Marília, SP Departamento de Morfologia e Fisiologia Animal/UNESP, Campus de Jaboticabal, SP Instituto de Biociências Departamento de Anatomia, Distrito de Rubião Jr. s/n, CEP 18618-000, Botucatu-SP Departamento de Anatomia/UNESP, Campus de Botucatu, SP Departamento de Morfologia e Fisiologia Animal/UNESP, Campus de Jaboticabal, SP