Although these systems are primarily responsible for the function of the uterus, the
perception of pain stems from different sites. Visceral afferent fibers from the uterine corpus
transmit pain signals to the brain by entering the spinal cord at the T11-T12 levels, whereas
spinal cord levels S2-S4 receive signals from the cervis, vagina, and perineum. Recognition
of this divergence is the key13, because of the pain fibers’ high entry point in the spinal cord
the block of lower stems will be insufficient for relieving pain independently of the type of
surgery (laparoscopic vs open procedure).