FCETAL NUTRITION: THE PLACENTA 



443 



an increase of superficies and of secreting epithelium, and are later 

 concerned in the attachment of the ovum. They have been recognised 



Sp 



FIG. 122. The uterine mucosa of the dog about the twenty-third day of 

 pregnancy. (From Duval's " Le Placenta des Carnassiers," Jour. (b> 

 UAnat. et de la Phys., 1893.) 



mes, Mesoblast ; tr, trophoblast ; <\ capillary layer ; e?, layer of glandular 

 detritus ; g, glands' of compact layer ; ftp, dilated glands of spongy layer. 



by all the authorities with the exception of Robinson, 1 who states that 

 he can find no evidence that any of the crypts are other than the ducts 

 of the uterine glands. At the first and each succeeding prooestrum 

 there is a marked hypenemia of the mucosa, and from the rupture of 



1 Robinson, Hunterian Lectures, Jour, of Anat. and Phys., vol. xxxviii., 1904. 



