1 Transmission: neurons transmit these signals to pain-processing structures of the spinal cord and brain. 2  Modulation: the signals can be amplified or dampened at various points in the pathway to facilitate or inhibit transmission, thereby enhancing or reducing the sensation of pain.
The sperm usually fertilizes the egg in the Fallopian tubes. Then, the fertilized egg moves down to the uterus where it implants, causing pregnancy. The segment of the Fallopian Tube where fertilization commonly occurs is the ampulla..
In general, the implantation is a phase of pregnancy occurs on average 9 days after ovulation, which involves attachment of the fertilized egg to the uterine lining. According to a variety of studies, fertilization of the egg can start in as few as 12 hours of ovulation, but no longer than 24 hours past ovulation.n general, the implantation is a phase of pregnancy occurs on average 9 days after ovulation, which involves attachment of the fertilized egg to the uterine lining. According to a variety of studies, fertilization of the egg can start in as few as 12 hours of ovulation, but no longer than 24 hours past ovulation.