gyrus subcallosus

sub·cal·lo·sal gy·rus

a slender vertical whitish band immediately anterior to the lamina terminalis and anterior commissure; despite its name, it is not a cortical convolution but is the ventral continuation of the transparent septum. The small ridge of tissue immediately rostral to the lamina terminalis is sometimes designated as a separate part of the subcallosal area and called the paraterminal gyrus [TA] (gyrus paraterminalis [TA]).

gyrus subcallosus

(1) Subcallosal gyrus; gyrus paraterminalis [NA6]. 
(2) Subcallosal area; area subcallosa [NA6].