Figure 3a-6: Axial section of the human pituitary gland at the level of the vestigial intermediate lobe (approximately representing the boxed area in the diagram). Note the cluster of remnants of Rathke’s pouch / cleft (RC). The arcs indicate the posterior (centre) and postero-medial (left and right) edges of the mucoid wedge (with scattered basophils) and pituitary wings (with scattered somatotrophs), respectively. The asterisk indicates basophil corticotrophs ‘spilling’ into the neurohypophysis (‘basophil invasion’, see figure 3a-7).