What is Which is not true regarding the basis of functional divisions of Liver? and explain in detail?
Ans: B. Divided into 8 segments(Ref Gray's 40/e p1165, 1166,1178; Sabiston 20/e p1484, 19/e p/1413-1417; Schwaz 10/e p1265, 9/e p1095; Bailey 27/e p1154, 26/e p1065-1067; Blumga 5/e p31-37; Shackelford 7/e p1426-1430)Most preferred option:Liver is divided into 8 segments.Segment IX - Aecent subdivision of segment I.Describes segment posterior to segment VIII.Functional anatomy of liver:Based on Couinaud's division of liver (Coninaud I957).Divided into eight (subsequently nine) functional segments.This is based upon distribution of poal venous branches & hepatic veins location in parenchyma.Sectors & segments of liver:Sectors of liver:Between one & three segments:Right lateral sector = Segments VI & VII.Right medial sector = Segments V & VIII.Left medial sector = Segments III & IV (and pa of I).Left lateral sector = Segment II.Segments of liver:Numbered in an ante-clockwise spiral centered on poal vein with liver viewed from beneath.Staing with segment I up to segment VI a then back clockwise for most cranial two segments VII & VIII.Fig 1: The fissures and sectors of the liver. (Right lateral = right posterior; right medial = right anterior)Fig 2: Segments of the liver (after Couinaud). (A) superior view; (B) posterior view; (C) anterior view; (D) inferior view.