584 



THE DUCTLESS GLANDS ENDOCRIN GLANDS 



FIG. 501. PHOTOMICROGRAPH OF PERIPHERAL REGION OF PINEAL BODY OF A 

 YEARLING SHEEP, TO SHOW THE CHARACTER OF THE PARENCHYMA, THE NEUROGLIA 

 CELLS AND FIBERS, AND THE INTERNEUROGLIA CELLS. 



In older specimens large lamellated masses of brain sand (acervulus 

 cerebri) appear, consisting chiefly of calcium carbonate and magnesium 

 phosphate. These specimens are also characterized by large edematous 



FIG. 502. Two NEUROGLIA AND THREE INTERNEUROGLIA CELLS FROM THE PINEAL 

 BODY OF A LAMB. X 1500. 



