The Museum of Sex dissects the little structure that "contains approximately 8,000 sensory nerve fibers; more than anywhere else in the human body and nearly twice the amount found on the head of a penis":
The fact is, though, that most of the clitoris is subterranean, consisting of two corpora cavernosa (corpus cavernosum when referring to the structure as a whole), two crura (crus when referring to the structure as a whole), and the clitoral vestibules or bulbs. … When erect, the corpora cavernosa encompass the vagina on either side, as if they were wrapping around it giving it a big hug! … What does all this mean? Well, for starters, we can finally end that age-old debate of vaginal vs. clitoral orgasms.
The Dish 