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..
Fertilization happens in the fallopian tube, and the fertilized egg then travels for about 5-6 days down the fallopian tube towards the uterus. Implantation happens when the fertilized egg arrives in the uterus and attaches to the uterine lining.Implantation occurs on average 9 days after ovulation and fertilization, it can happen as early as 6 days after ovulation until 12 days after ovulation.The timing of implantation spotting is within a day or so after implantation, about 9-10 days after ovulation and fertilization.Implantation happens between 6 and 12 days after ovulation, so about 9-10 days after ovulation would be the right time for implantation bleeding and spotting.ertilization happens in the fallopian tube, and the fertilized egg then travels for about 5-6 days down the fallopian tube towards the uterus. Implantation happens when the fertilized egg arrives in the uterus and attaches to the uterine lining.