What are the nine liver subsegments according to Couinaud?

Couinaud divides the liver into superior and inferior portions at the porta hepatis, creating nine liver subsegments.
1 Caudate lobe
2 Superior lateral segment (left lobe)
3 Inferior lateral segment (left lobe)
4a Superior medial segment (left lobe)
4b Inferior medial segment (left lobe)
5 Inferior anterior segment (right lobe)
6 Inferior posterior segment (right lobe)
7 Superior posterior segment (right lobe)
8 Superior anterior segment (right lobe)