Table 2.

Cytoarchitectonic characteristics of areas Fo4–Fo7 in the lateral orbitofrontal cortex (lateral OFC) and neighboring areas.

Area	Cytoarchitectonic characteristics
Fp1	Sharp border between layers I, II and III
	Dense layers II and IIIc
	Considerably larger pyramids in deeper than in upper layer III
	Broader layer IV than Fp2
Fo3	Large pyramidal cells in layer IIIc
	Inner granular layer with higher cell density and more prominent in its anterior than posterior part
	Layer Va of Fo3 with higher cell density than the respective layer of Fo4
Fo4	Narrow cortex throughout the area
	Indistinct borders between layers II, III, IV and V
	Uniformly packed layer III
	Middle-sized pyramidal cells in layer Va
Fo5	Very large pyramidal cells in densely packed layer IIIc
	Broad layer III
	More dense layer IV and V than Fo4
Fo6	Decreasing cell size in layer III from deeper to upper part
	Broad and cell-dense layer IV
	Middle-sized pyramidal cells in layer Va
Fo7	All layers very densely packed
	Indistinct borders between layers II, III, IV and V
	Large pyramidal cells in a deeper part of broad layer III
	Broad layer II, IV and V
	Layer IV more cell dense than Fo4–Fo6

Descriptions for Fp1 and Fo3 adapted from Bludau et al. (2014) and Henssen et al. (2016), respectively.