title: Study on optic microscope of the muscle and elastic components of the aorto-iliac bifurcation septum and initial segment of the middle sacral artery.
abstract: In this work the aorto-iliac bifurcation septum and the initial segment of the middle sacral artery were analyzed through optic microscope. 20 anatomical pieces of corpses from subjects of both sexes aging from 20 to 33 years were examined. After collection of pieces and fixation in formaline for 48 hours, histological sections of 20 microns were made and stained with the methods of Weigert, Verhoeff and Picrofucsine of Van Gieson. It was observed that the middle sacral artery arises from the posterior aortic wall laterally to the aorto-iliac bifurcation septum. The sequential analysis of the sections showed that the septum is lined by a thickening of connective tissue along its length and elastic fibers predominate on its central portion. Bundles of muscle fibers prevail on the lateral and posterior regions. It was observed, above the origin of the middle sacral artery, a reorganisation of tissues which represents, more caudally, the ostium of the artery. It was verified that the middle sacral artery arises at the aorto-iliac bifurcation septum, which is a transitional region and should be classified of mixed type and called aorto-septo-sacral transition.
authors.affiliation: Depto. de Ciêncas Morfofistiológicas, Universidade Estadual de Maringá, PR, Brasil.
authors.forename: C I
authors.initials: CI
authors.lastname: Conegero
authors.forename: R P
authors.initials: RP
authors.lastname: Chopard
authors.forename: M H
authors.initials: MH
authors.lastname: Miranda-Neto
authors.forename: M A
authors.initials: MA
authors.lastname: Soares
mesh_terms: D000328:Adult; D001011:Aorta / Q000648:ultrastructure*; D004547:Elastic Tissue / Q000648:ultrastructure*; D005260:Female; D006801:Humans; D007083:Iliac Artery / Q000648:ultrastructure*; D008297:Male; D008853:Microscopy / Q000379:methods; D009131:Muscle, Smooth, Vascular / Q000648:ultrastructure*; D012445:Sacrococcygeal Region / Q000098:blood supply*