title: Anatomy of the intrahepatic ramification of the portal vein in the right hemiliver.
abstract: The ramification of the portal vein in the right hemiliver was studied by anatomic dissection in 36 formalin-fixed human livers. In 28/36 (77.8%) cases, the portal vein bifurcated into a right branch and a left branch and the right branch bifurcated into anterior and posterior segmental branches. The anterior segmental branch terminated in the anterosuperior subsegment (S(8)) in two types: bifurcated when it divided into anterior P(8) and posterior P(8 )branches towards the respective regions of S(8) (24/28 cases) and monopodal when it had a single pedicle (4/28 cases). The maximum anteroinferior subsegmental branch (P(5 )maximum) originated either from the anterior segmental branch (16/28 cases) or from the anterior P(8) branch (12/28 cases). The posterior segmental branch vascularized the posteroinferior (S(6)) and the posterosuperior (S(7)) subsegments, and was terminated in three types: fan-shaped (16/28), bifurcated (9/28) and tripodal (3/28). In 4/36 (11.1%) cases the portal vein bifurcated into a right branch and a left branch but the posterior segmental branch was not present. In 4/36 (11.1%) the right branch of the portal vein was not present. These anatomical variations are explained separately and finally all cases are considered as a whole.
authors.affiliation: Instituto de Ciências Biológicas e Química, Pontifícia Universidade Católica de Campinas, São Paulo, Brazil. ortalejr@correionet.com.br
authors.forename: J R
authors.initials: JR
authors.lastname: Ortale
authors.forename: C H
authors.initials: CH
authors.lastname: Naves De Freitas Azevedo
authors.forename: C
authors.initials: C
authors.lastname: Mello De Castro
mesh_terms: D006801:Humans; D008099:Liver / Q000098:blood supply*; D008102:Liver Circulation; D011169:Portal Vein / Q000033:anatomy & histology*