The Anatomy, Embryology, Com 

 parative Anatomy, and His- 

 tology of the Pineal 



E. V. COWDEY 



NEW YORK 



Anatomy 



The pineal body derives its name from the Latin, pinealis, a pine- 

 cone, which it resembles in shape. 



Gross Morphology and Relations. It is attached by a short stalk to 

 the posterior boundary of the dorsal surface of the third ventricle (Fig. 1). 



Corpus callosnm 



Lamina choroidea 

 eprthelialis 



Sinus sagittalis 

 superior 



Falx cerebrftdnra) 



aehnoid 

 Pia 



Commissura 



haben 



R^cessus pinealis 

 Corpus pineate 



Commissnra 



posterior cerebri 

 Lamina 



qnadrigenmii_ 



Aquaednctus cerebri 



\ 



Cerebellum 



Fig. 1. Diagram of the relations of the human pineal body with dura, yellowy 

 arachnoid, green; pia, red. 



The cavity of the ventricle extends for a short distance into the stalk, 

 forming the recessus pinealis. It rests on the midbrain, in the de^ 



3 



