THE PITUITARY 



341 



arranged in layers of varying thickness closely applied to 

 the body and neck of the posterior lobe and to the under- 

 surface of adjacent parts of the brain. The part of it which 

 is separated from the anterior lobe by the cleft is almost 



p.l. 



p.n. 



FIG. 95. Section through a portion of the pituitary body of the dog, showing 

 the glandular and nervous portions and the pars intermedia. (Drawn by 

 Mrs. Thompson.) 



c., cleft in glandular portion (between glandular portion proper and the inter- 

 mediate portion) ; p.g., glandular portion ; p.i., intermediate portion ; 

 p.n., nervous portion. 



In the glandular portion are seen three kinds of cells. 



devoid of bloodvessels. Colloid material occurs between the 

 cells of the pars intermedia. (Fig. 95.) 



The nervous portion is made up of neuroglia cells and 

 fibres, and is invaded by the epithelial cells of the pars inter- 

 media. A substance resembling the colloid of the thyroid 

 gland occurs in the nervous portion. The glia cells are longish 



