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..
1 In humans fertilization occurs in the end of the fallopian tube away from the uterus (close to the ovary). 2  The egg and the associated cumulus cells are ovulated (released) from an ovarian follicle and picked up by the fallopian tube. 3  The tube pulls it inside where the sperm can find it.