B. 



3 



FIG. 85. Chorionic villi of an ovum of five weeks. A, longitudinal section ; 7>, transverse section. 

 Greatly magnified. 1, cellular stratum of Langhans ; 2, syncytium ; 3, processes of syn- 

 cytium ; 4, foetal capillary vessels ; 5, connective tissue of villus (stroma). 



