The ovaries contain eggs (also called ova). During puberty the ovaries start releasing eggs. This happens around once a month.
The fallopian tubes connect the ovaries to the uterus. The egg travels down the fallopian tubes to the uterus.
The uterus grows a thick lining each month to prepare for a possible pregnancy. If there is no pregnancy then the uterus sheds its lining. This is called a menstrual period.
The cervix connects the vagina to the uterus. It has a tiny gap that lets some things (like sperm) up to the uterus and some things (like period blood) down to the vagina.
The vagina is a strong, stretchy passage that connects the vulva to the cervix. Period blood and discharge come out of the vagina.
The vulva is the name for the outer area of the genitals. For more information on the different parts that make up the vulva see here