210 



PLACENTA OF THE UXGULATA. 



glands of the uterus open (fig. 155 g) (Turner). The maternal and foetal 

 parts of the placenta in the pig separate with very great ease. 



cr cr 



FIG. l.j;3. SrKF.u'K-viEW OF THE INJECTED UTKIUNE MUCOS.V OF A GRAVID PIG. (From 



Turner.) 



The fig. shews a circular nun-vascular spot where a gland opens (g) surrounded by 

 numerous vascular cry] its (rr|. 



lu the mare (Turner), the foetal villi are arranged in a less definite 

 zonary band than in the pig, though still absent for a very small area at 

 both poles of the chorion, and also opposite the os uteri. The filiform villi, 

 though to the naked eye uniformly scattered, are, when magnified, found to 

 be clustered together in minute cotyledons, which fit into corresponding- 

 uterine crypts (fig. 156). Surrounding the uterine crypts are reticulate 



. 



FIG. 156. VERTICAL SECTION THROUGH THE INJECTED PLACENTA OF A MARE. 



(From Turner.) 



ch. choriou with its villi partly in situ and partly drawn out of the crypts (cr); 

 E. loose epithelial cells which formed the lining of the crypt; g. uterine glands; 

 c. blood-vessels. 



