The clitoris is a sexual organ located at the top of the vulva, where the inner lips of the labia meet. Its sole known function is to produce pleasure. What most people think of as “the clit” is actually just a small external tip of a much larger structure that extends inside the body, with internal components that play an active role during arousal.
External and Internal Anatomy
The visible part, called the glans, is a small rounded nub that sits just above the urethral opening. On average, it measures about 1 to 1.5 centimeters long and roughly half a centimeter wide, though there is considerable individual variation. A fold of skin called the clitoral hood covers the glans and protects it, similar to how the foreskin covers the head of a penis. That protection matters because the glans is extraordinarily sensitive, and constant direct exposure can cause discomfort or pain.
Beneath the glans, a short shaft (called the body) extends downward and then splits into two legs, known as the crura. These legs are actually the longest parts of the entire structure. They fan out in a wishbone shape, surrounding the vaginal canal and urethra on either side. Nestled between the crura and the vaginal wall are two masses of tissue called the vestibular bulbs. Including all of these internal components, the total length of the clitoris averages around 16 millimeters from glans to where the body begins to branch, but the legs extend significantly further.
Think of it like an iceberg: the glans is the small tip you can see, while the crura and vestibular bulbs form a much larger hidden network of tissue beneath the surface.
Why It Has Over 10,000 Nerve Fibers
The clitoris is the most nerve-dense structure in the human body relative to its size. A 2022 study from Oregon Health & Science University counted the nerve fibers in the main nerve supplying the clitoral glans and found an average of about 5,140 fibers per side. Because the nerve is symmetrical, that puts the total at more than 10,280 fibers from the primary nerve alone. The clitoris also has additional smaller nerves beyond this one, so the true count is even higher.
This density of nerve endings is what makes the clitoris the primary source of sexual pleasure for most women. It is the only known human organ whose sole identified purpose is to generate pleasurable sensation. It plays no direct role in urination or reproduction.
What Happens During Arousal
During sexual arousal, increased blood flow causes the clitoris to swell and become erect, much like a penis does. This happens because the clitoris contains the same type of spongy erectile tissue found in the penis. The glans becomes engorged, and the internal structures respond too: the vestibular bulbs can double in size as they fill with blood.
That internal swelling has a chain of effects. The expanding crura and vestibular bulbs put pressure on the vaginal wall from the outside, which triggers the release of lubricating fluid inside the vagina. The swelling can also cause the outer labia to puff up noticeably. All of this increases sensitivity and makes penetration more comfortable.
At peak arousal, the glans can become so sensitive that direct touch feels overwhelming or even painful. After orgasm, the blood gradually drains, the swelling subsides, and the tissue returns to its resting size. This full cycle from arousal through resolution mirrors what happens with an erection in men.
How It Develops Before Birth
The clitoris and the penis actually develop from the same embryonic tissue, called the genital tubercle. In early fetal development, this structure is identical regardless of chromosomal sex. Around the eighth week of pregnancy, hormones determine which direction development takes. With androgens present, the tissue elongates into a penis. Without that hormonal signal, it develops into a clitoris.
Because of this shared origin, the two organs have directly corresponding parts. The glans of the clitoris is the equivalent of the glans (head) of the penis. Both contain the same type of erectile tissue surrounded by a tough outer layer. The clitoral hood corresponds to the foreskin. These parallels explain why the arousal response is so similar in both organs: the underlying tissue and nerve wiring share a common blueprint.
Normal Variation in Size and Sensitivity
There is no “standard” clitoris. The glans can range from barely visible to prominently protruding, and both ends of that spectrum are completely normal. Hormonal differences account for much of this variation. Androgen levels, which fluctuate naturally across a woman’s life, directly affect clitoral size because the tissue contains androgen receptors. During menopause, hormonal shifts can change both the size and sensitivity of the clitoris. Hormonal therapies that include androgens can cause the glans to grow up to 2 centimeters in width.
Sensitivity varies just as much as size. Some women find direct touch on the glans pleasurable, while others prefer stimulation through the hood or on the surrounding tissue. Neither preference indicates a problem. The concentration of nerve fibers means that the type of touch that feels good is highly individual, and it can change depending on the stage of arousal.