186 HAROLD J. COOPER 



I. Pars buccalis (glandularis) 



1. Pars distalis 



2. Pars juxta-neuralis 



a) Pars infundibularis 



b) Pars tuberalis 

 IT. Pars neuralis 



1. Eminentia saccularis 



2. Infundibulum 



3. Processus infundibuli 



Stendell ('13) describes with accompanying illustrations, in 

 many of the lower forms the relationship existing between the 

 different parts of the gland (glandular and neural). Sterzi and 

 Gentes, as cited by Stendell, called the pars distalis the chrom- 

 ophilic and the juxtaneural portion the chromophobic, on 

 account of the characteristic staining reactions. Tilney ('11) 

 and ('13) pictures the parts in the human; Herring ('08), in the 

 cat, dog, and monkey, each of which possesses its own peculiarity. 

 Swale Vincent ('12) speaks of three types of hypophyses 

 among the mammalia according to the degree of investment 

 of the nervous lobe by epithelium and according to the extent to 

 which the nervous lobe is invaded by the cavity of the third ven- 

 tricle. The first type (cat) has a hollow nervous lobe, the cavity 

 communicating freely with that of the third ventricle. The 

 epithelial investment is very complete. The second type (dog) 

 has a solid nervous lobe, but a patent infundibulum. Here, too, 

 there is a very complete investment. In the third type (man) 

 both the nervous lobe and infundibulum are solid, although 

 traces of a lumen in the latter may exist. The epithelial 

 investment here is not so complete. 



The classification of the cells in the pars glandularis is volumi- 

 nously discussed in the older papers. Flesch ('84) classified 

 them as chromophile and chromophobe. Dostoiewsky ('86) 

 endeavored to establish a relationship between the granular and 

 non-granular cells in regard to their distribution. In 'the ox 

 and in man he found that the alveoli lying more peripherally 

 were made up of a greater proportion of granular cells than those 

 lying centrally. He also found that in these forms, the cells 



