The main function of fimbriae of the Fallopian tube is:

$X$ - The oviducts,uterus and vagina constitute the female accessory ducts.
$Y$ - The male sex accessory ducts include vasa efferentia,epididymis and vas deferens,while the rete testis is an external genital organ.

Given below are two statements:
Statement $I$: The presence or absence of hymen is not a reliable indicator of virginity.
Statement $II$: The hymen is torn during the first coitus only.
In the light of the above statements,choose the correct answer from the options given below:

The estrogen is synthesised and secreted mainly by growing ...$A$.... After ovulation the ruptured follicle is converted to a structure called ...$B$... which secretes ...$C$... Choose the correct option for $A, B$ and $C$.

The accessory ducts of the female reproductive system are $.......$

Explain the external and internal structure of the uterus.