Clitoris Anatomy 101: Most of It Is Hidden

The “tiny button” myth

For much of the twentieth century, anatomy textbooks drew the clitoris as a small nub — if they drew it at all. Some influential textbooks gave it little or no detail. So it’s no surprise that many adults still picture something pea-sized.

The picture changed thanks largely to urologist Helen O’Connell and colleagues in Melbourne, who combined careful dissection with MRI imaging from the late 1990s onward. Their 2005 review in the Journal of Urology put it bluntly: typical textbook descriptions of the clitoris “lack detail and include inaccuracies.” The clitoris, they showed, is a three-dimensional, multiplanar organ with a broad attachment to the pubic arch — impossible to capture in a single flat diagram. Interestingly, a 19th-century anatomist, Georg Ludwig Kobelt, had described much of it accurately; the knowledge was simply lost or ignored.

The parts, at a glance

Part	Where it is	What it does
Glans	The only visible part, at the top where the inner labia meet	Densely supplied with nerves; usually the most sensitive point. Not erectile tissue.
Hood	A fold of skin over the glans	Protects the glans; direct touch is often too intense without it.
Body (shaft)	Runs upward and back from the glans, under the skin	Erectile tissue; bends like a boomerang before splitting into the crura.
Crura (two “legs”)	Extend back along the pubic bones	Erectile tissue that anchors the structure to the pelvis.
Bulbs (two)	Sit on either side of the vaginal opening, beneath the labia	Spongy erectile tissue that swells with blood during arousal.

Put together, the shape is often compared to a wishbone or an upside-down “Y” with extra wings. Estimates of total size vary between people and between studies, but figures of roughly 9–11 cm from tip to the ends of the crura are commonly cited. In other words: most of it is internal, and it is much bigger than most people think.

Arousal: a lot happens beneath the surface

The clitoris is made of the same kinds of tissue as the penis: the body, crura and bulbs are erectile and fill with blood during arousal, and O’Connell’s review notes that clitoral pharmacology and microscopic structure appear to parallel penile tissue. The nerves that serve it are substantial — large branches of the pudendal nerve that travel along the top of the clitoral body and into the glans.

This has a practical implication. Arousal takes time. Blood flow to the internal structures, swelling, and natural lubrication don’t happen in seconds, and rushing past that phase is one of the most common reasons sex feels underwhelming or uncomfortable.

“Vaginal” vs “clitoral” orgasm

Freud famously claimed that “mature” women should orgasm from penetration alone. That idea caused decades of needless worry. Modern anatomy suggests the distinction is blurrier than he imagined: the bulbs and crura sit right alongside the vaginal walls and urethra, and O’Connell’s group describes the clitoris, distal urethra and vagina as a tissue cluster that appears to be the centre of female sexual response. Some researchers call it the clitourethrovaginal complex.

So when penetration feels good, part of what’s happening may be indirect stimulation of the internal clitoris. There is no “better” kind of orgasm — only what works for a given body.

Why most women need external stimulation

Because the most nerve-dense part sits outside, many women need it involved. In a 2018 nationally representative survey of 1,055 US women aged 18 to 94, published in the Journal of Sex & Marital Therapy:

• 18.4% said intercourse alone was sufficient for orgasm.
• 36.6% said clitoral stimulation was necessary for orgasm during intercourse.
• Another 36% said it wasn’t strictly needed, but orgasms felt better with it.

The same study found that women’s preferences for touch — location, pressure, rhythm, pattern — were remarkably diverse. There’s no universal technique. That’s why curiosity and communication beat any “one weird trick.”

Knowledge helps — but it’s not the whole story

A 2005 study of 833 university students found that the most common sources of clitoral knowledge (school and friends) were linked to the least accurate answers, while self-exploration — rarely cited — was linked to better knowledge. Knowledge correlated with women’s orgasm frequency in solo sex, but not in partnered sex. The authors’ interpretation: knowing the anatomy matters, but couples also need to prioritise it. (More on that in our piece on the orgasm gap.)

Three myths, quickly

• “It’s tiny.” The visible glans is small; the whole organ is not. Most of it sits beneath the surface, along the pubic bones and around the vaginal opening.
• “The G-spot is a separate organ.” Researchers still debate this. A leading explanation is that sensitivity on the front vaginal wall reflects the surrounding cluster of clitoral, urethral and vaginal tissue rather than a distinct structure.
• “Needing clitoral stimulation means something is wrong.” It’s the most common experience, not the exception. Anatomy, not inadequacy, explains it.

The bottom line

The clitoris is a large, mostly internal organ whose visible tip is only the beginning. If you’ve ever felt “broken” because penetration alone doesn’t do it for you, the anatomy says you’re in the majority. Learning your own body — at your own pace — is legitimate health education, not a luxury.