What is the significance of ampullary-isthmic junction in the female reproductive tract ?
In human beings, normally in which one of the following parts, does the sperm fertilize the ovum?
$X$ - The oviducts, uterus and vagina constitute the female accessory ducts
$Y$ - The male sex accessory ducts includes vasa efferentia, epididymis and vas deferens while rete testis is an external genital organ
Explain external and internal structure of uterus.