EPIPHYSIS CEREBEI 585 



areas. The interneuroglia cells have been variously designated as 

 'pineal cells/ 'epithelial cells/ 'lymphoid cells' and 'secretory cells/ ~ Cer- 

 tain workers claim to have distinguished, in certain mammals, two types 

 of cells, basophils and acidophils. Occasionally smooth and striped 

 muscle fibers have also been described in a few forms (e.g., ox). No 

 nerve cells are demonstrable. Sympathetic nerves accompany the blood- 

 vessels; and a few of the medullated type are found near the attached 



FIG. 503. CELLS FROM PINEAL OF YEARLING SHEEP. 



A, neuroglia cell and fibers; B, interneuroglia cell with melanic pigment granules. 

 X 1500. 



portion, probably taking origin from the habenular and posterior com- 

 missures. The blood supply is very profuse. It takes origin from 

 the pial vessels which are in union with the blood-vessels of the tela 

 choroidea anteriorly. The vessels follow the ramifications of the pial 

 septa. In the sheep the capillaries frequently terminate in the form 

 of tangled loops or 'glomeruli' within spaces surrounded by more com-* 

 pact parenchyma ('follicles'). Cross sections of the coarser trabeculae 

 show a pair of vascular comites. 



The dependence of normal liver function upon the integrity of the 

 ductless glands is indicated by derangements following their removal 

 (Whipple and Christian, Jour. Exp. Med., 29, 3, 1914). Many other 

 37 



