70 LABORATORY DIRECTIONS 



cornua may be greatly swollen. The posterior end of the uterus 

 is telescoped into the vagina, forming a slight swelling where 

 the uterus and vagina overlap. The telescoped portion of the 

 uterus is known as the cervix uteri (meaning neck of the uterus) ; 

 the opening between uterus and vagina is the os uteri (meaning 

 mouth of the uterus). These structures may be seen by splitting 

 open the vagina and the body of the uterus. 



The vagina extends posteriorly until it is joined by the 

 urethra from the bladder to form the urogenital sinus, a small 

 space common to both the excretory and the reproductive 

 systems. The external opening of the urogenital sinus lies 

 ventral to the anus and is known as the vulva. Cut open the 

 urogenital sinus and find the opening of the urethra. 



