826 INDEX. 



Y. Yelk-sac, 748. 



Yelk, or vitellus, 721. Yellow-elastic fibre, 45. 

 changes of, in Fallopian tube, 741. nbro-cartilage, 50, 52. 



in uterus, 743. spot of Sommering, 640, 642. 



cleaving of, 741. 



constriction of by ventral lamina, 



746. Zona pellucida, 720, 741. 



