194 



FREDERICK TILNEY AND LUTHER F. WARREN 



Marburg also gives an interesting description of the develop- 

 ment of the suprapineal recess in man which is illustrated in 

 figure 96. According to his description, the suprapineal recess 

 is formed by the dorsal reflection of the taenia which originally 

 was directed cephalad. The dorsal surface of the taenia secon- 

 darily becomes fused with the dorsal surface of the pineal gland 

 while the ventral surface is turned dorsad. In this way the 

 suprapineal recess results from a deep evagination of the roof- 



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Fig. 95 Cross section of the pineal gland in a 26 mm. human embryo, according 

 to Marburg, 1909. 



plate which comes to lie above the pineal body and extends in 

 most cases the entire length of that organ. The suprapineal 

 recess in its relation to the pineal gland in adult man is shown in 

 figure 97. 



With reference to the pineal body Marburg maintains that in 

 spite of all the involution processes in the gland, it cannot be 

 denied that even up to the late periods of life in man there are 

 wholly intact glandular cells present in the organ which must 

 certainly be taken to indicate a still existing function. 



