The scientific name for the external "little button" or "bulb" [of the clitoris] is glans.  Not to be confused with glands, glans simply refers to a small circular mass.  This little structure 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.