Six distinct types of cell can be distinguished in the pars distalis of the pituitary gland of the female ferret after staining by performic acid-Alcian blue followed by periodic acid-Schiff (PAS)-orange G. The first of these types contains coarsely granular PAS-positive material; the second contains granules which stain with Alcian blue, with or without PAS-positive material; while the third contains finely granular or diffuse PAS-positive material. The fourth type of cell, apparently equivalent to the 'carminophil' of other species, stains deep orange due to a combination of staining with orange G and a weakly positive PAS reaction. The fifth type is the ordinary acidophil, and the sixth the chromophobe.
The pars tuberalis is extensive, and may be compact or lobulated. The pars intermedia contains two types of cell, but shows no obvious secretory characteristics. The neural process consists of a central zone which resembles the stalk in structure, and a peripheral, more vascular zone which contains the bulk of the neurosecretory material. A nucleus of small nerve cells lies in the junctional region where the stalk joins the main neural process.
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