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Made available in DSpace on 2013-08-12T18:37:29Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-03-01 Made available in DSpace on 2013-09-30T18:35:14Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-03-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:47:33Z No. of bitstreams: 0 Made available in DSpace on 2014-05-20T13:47:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-03-01 The surface epithelium of the vas deferens of Agouti paca, a wild and large South American rodent, was basically formed by principal and basal cells being only the principal cells related to endocytosis processes and also secretion taking base on their cytoplasmic ultrastructural features. Principal cell of vas deferens epithelium were characterized mainly by presence of vesicles with several shapes, sizes and internalized content at their apical cytoplasm occurring smaller pits and pale small vesicles seen next to the apical brush border of microvillus. Moreover, coated vesicles, smooth surface vesicles and great vesicles; multivesicular bodies, endosomes and lysosomes were seen. Presence of an apocrine secretory apparatus was also viewed, showing apical cytoplasmic expansions protruding into the vas deferens luminal compartment. The basal flattened cells, without luminal surface contact, occurred next to the basement membrane of the ductus, and did no exhibit special ultrastructural features. UNESP, Dept Anat, Campus de Botucatu, SP, Brazil Ctr Univ Sao Jose do Rio Preto, Sao Jose do Rio Pre, SP, Brazil UNESP, Dept Morfol & Fisiol Anim, Campus de Joboticabal, SP, Brazil UNESP, Dept Anat, Campus de Botucatu, SP, Brazil UNESP, Dept Morfol & Fisiol Anim, Campus de Joboticabal, SP, Brazil

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