<prompt> In human, fertilization usually occurs in theFimbriated end of uterine tubeAmpulla of the uterine tubeIsthmus of the uterine tubeUterine cavity  <response>: B. i.e. Ampulla of the uterine tube 448 - Ganong 423 - Ganong 23rd In humans Fertilization of the ovum by the sperm usually occurs in the ampulla of uterine tube lined by ciliated columnar epithelium AI - 09, occurs within few hours Among 200- 300 million of sperms entering female genital tract only few thousand sperms reach the spot near the ovum and only one sperm fertilizes the ovum Implantation of the fertilized ovum occurs between 5-7 days after fertilization. Spermatogeneis occurs at temperature lower than core body temperature AI- 09 