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..
Background Information. Fertilization of an egg by a sperm occurs soon after its release from the ovary (ovulation) into the fallopian tube to form a single cell embryo (zygote) containing the genetic material of the sperm and egg.The zygote then divides progressively into a multi-cell embryo.ackground Information. Fertilization of an egg by a sperm occurs soon after its release from the ovary (ovulation) into the fallopian tube to form a single cell embryo (zygote) containing the genetic material of the sperm and egg.