title: [Configuration of the liver segment observed in the frontal section including the origin of the left portal trunk at the hepatic hilum].
abstract: After preparing threparing the frontal section including the origin of the left portal trunk at the hepatic hilum, 60 human livers (35, entirely; 25, partly) were dissected to reveal segmental configuration and the supplying portal vein branches. We usually observed two combinations of segments, i.e., S2, 4, 5 and 8 or S2, 3, 4, 5 and 8, in the frontal section including the origin of the left portal trunk. However, S8 was sometimes absent in the section when S4 extended to the right and/or upper side. S2 was consistently located dorsal to S3 despite the fact that 11.7% of the specimens carried an unexpected configuration showing a "lower" S2 in combined with an "upper" S3 in the frontal section. The latter case was associated with specific S2 and S3 segmental branches maintaining horizontal courses along a common plane. S4, S5 and S8 were usually arranged from the ventral to the dorsal aspect in this order. Four types of ventral short branches originated at or near the primary portal divisions and supplied the hilar parenchyme adjacent to S4 and/or the anterior segment (S5 or S8). These ventral short branches tended to be associated with the variations of the primary division. Dissection of the liver after frontal section provided a better understanding of the segmental configuration rather than an approach from the hepatic hilum.
authors.affiliation: Sapporo Medical University School of Medicine.
authors.forename: Y
authors.initials: Y
authors.lastname: Nagaoka
authors.forename: S
authors.initials: S
authors.lastname: Miyamoto
authors.forename: G
authors.initials: G
authors.lastname: Murakami
authors.forename: F
authors.initials: F
authors.lastname: Hata
authors.forename: K
authors.initials: K
authors.lastname: Hirata
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008099:Liver / Q000033:anatomy & histology*; D008297:Male; D008875:Middle Aged