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 normal pregnancies, a fertilised egg implants itself in the lining of the womb where it grows and develops. But in an ectopic pregnancy, the egg implants itself in the fallopian tube â which leads from the ovary to the womb. In rarer cases it implants itself in the abdominal cavity or an ovary. Around one in 60 to one in 80 pregnancies are ectopic â and in the vast majority the baby cannot be saved.