A — Section through a glial plaque of an adult human pineal gland showing 

 sparsely scattered oval nuclei, imbedded in a reticulum of glial fibres, 

 x 194 D. Gli. : glial tissue. 



B — Section through another part of the same gland as A, less highly magnified. 

 The parenchymatous tissue, Par., contains closely packed cells with large, 

 deeply stained, round nuclei. The glial tissue, Gli., on the left is devoid of 

 parenchyma cells. 



C — Section of pineal tumour showing lobules of tumour tissue, T. Tis., on the 

 right of the photograph and strands of degenerated glial tissue on the left, Gli. 



