Contraction of uterine pain is carried by
L 1,2,3
T 12, L 1,2,3
T 10,11,12 L 1
L 3,4,5 S 1,2
In the early stages of labour pains are mainly uterine in origin because of painful uterine contractions It is distributed along the cutaneous nerve distribution of T10 - L 1. In the later stages pain is due to cervical dilatation This pain is referred to back through sacral plexus. Ref: Dutta Obs 9e pg 112.
General obstetrics