Light micrograph of a cat pituitary gland showing the posterior lobe (top) stained with a method for neurosecretion. Below is the pars intermedia, Rathke's cleft (well visible in this species) and a small portion of the anterior pituitary. The neurosecretory material is distributed throughout the posterior pituitary showing a clear tendency to accumulate in the vicinity of the blood vessels. Some Herring bodies are observed. The orange-stained structures are blood vessels filled with red blood cells. Paraldehyde-thionine.