344 



HUMAN UTERUS AND FCETAL APPENDAGES. 



ture being syncytial. The nuclei are smaller and more deeply stained than those 

 of the inner layer. In the trophoblast we find great masses of cells somewhat 

 similar to those of the cellular layer upon the chorionic membrane and over the 

 surface of the villi, but they are larger and more lightly stained. They lie 

 closely packed together; their nuclei are rounded in form, but vary considerably 

 in size and shape. Many of them contain one or two distinct spots, which, how- 



Tro. 



Fig. 199. — Portion of the Preceding Figure More Highly Magnified. 



deg. Degenerating ectoderm. Ec', Outer syncytial layer of ectoderm. E<", Inner cellular layer of ectoderm. 



mis, Mesoderm of villus. Tro, Trophoblast. V '5° diams. 



ever, are sometimes absent. On the edges of the spaces which have been formed, 

 and sometimes apparently in the interior of the mass of trophoblast, we find 

 bands and lines of degenerative material in which we can find nuclei, but no 

 distinct cell boundaries. The substance between the nuclei is more or less uni- 

 formly granular in texture and stains quite deeply. The nuclei of the degenera- 



