90 OBSTETRICAL PHYSIOLOGY. 



uterine cotyledons, and in consequence bring the larger tufts of the 

 allantois into contact with the opposite parts of the chorion. The inter- 

 mediate caruncles become entirely wasted. Nevertheless, with isolated 

 tufts, sometimes in a great many, we find an increased development, 

 which gives rise in the corresponding uterine mucosa to a similar forma- 

 tion, and a close co-optation, or even an inter-penetration of these 

 accessory foetal and maternal cotyledons. 



When gestation has commenced, the surface of the maternal 

 caruncles, previously smooth, becomes convex, and is covered with 



Fig. 55. 



Maternal and Fcetal CoxtLEDONS of the Cow. 



A, Pedicle of the Maternal Cotyledon ; B, B, Maternal Cotyledon ; C, Fcetal 

 Cotyledon ; D, "Placental Villi ; E, Chorion. 



reticulate processes which border the crypts, and give it a finely cribbled 

 appearance. The largest are found in the body of the uterus, and they 

 become smaller as they approach the extremity of the cornua. They 

 arise from the uterine surface by a somewhat narrow pedicle, through 

 which they receive their bloodvessels, and their colour is nearly always 

 dark yellow ; altogether in shape, hue, and general appearance, they 

 are not unlike a morel mushroom. 



The " foetal" or " chorial cotyledons " repeat the disposition of the 

 maternal cotyledons. They are bright-red concave patches, each 

 exactly fitting into the sinuses of the corresponding uterine processes, 

 with which they strikingly contrast in hue ; on their surface they offer 

 a multitude of long, conical, ramifying, or branched vilh, measuring 



