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..
However, in some cases, the egg may implant in other reproductive areas resulting in an ectopic pregnancy. Ectopic pregnancy can occur in the following places: Abdominal cavity: Even though such cases are rare, it may happen that the fertilized egg implants in the abdominal cavity of the mother. It may begin as a tubal pregnancy and the fertilized egg may move from the tube to the abdomen.