Final answer:
The superior two-thirds of the vagina receives autonomic innervation from the uterovaginal plexus (sympathetic) and the pelvic splanchnic nerves (parasympathetic).
Step-by-step explanation:
The innervation of the superior two-thirds of the vagina is autonomic. It receives sympathetic innervation from the uterovaginal plexus and parasympathetic innervation from the pelvic splanchnic nerves (S2-S4). These nerve fibers convey sensations such as pressure and pain, and sympathetic fibers also cause the constriction of blood vessels. The superior portion of the vagina, called the fornix, meets the protruding uterine cervix. It is important to note that the inferior part or the lower one-third of the vagina receives somatic innervation from the pudendal nerve, which handles the sensation of touch and temperature.