The<unk>  is a small square<unk> , situated in the anterior cerebellar notch. It overlaps the lingula, from which it is separated by the precentral fissure; laterally, it extends along the upper and anterior part of each hemisphere, where it forms a wing-like prolongation, the ala<unk> <unk> is.
Central lobule
Periaqueductal gray
Lateral horn
Genu of internal capsule
Area postrema
Ventral tegmentum
Frontal lobe
Zona reticularis