The isthmus (ICG) appears in the following sections (posterior to anterior) of the macaque brain (Macaca fascicularis)
Medial

Medial

Ventral

Ventral

ac -22 mm

ac -22 mm

ac -21 mm

ac -21 mm

ac -20 mm

ac -20 mm

ac -19 mm

ac -19 mm

ac -18 mm

ac -18 mm

ac -17 mm

ac -17 mm

ac -16 mm

ac -16 mm