“Clit” is the common shorthand for clitoris, a sexual organ located at the front of the vulva. It is the only known organ in the human body whose sole purpose is providing pleasure. While most people think of it as a small, visible nub, the full structure extends deep inside the body and is far larger than it appears from the outside.
The word itself has ancient roots. “Clitoris” comes from the Greek kleitoris, which has been translated as both “little hill” and “to rub,” likely an intentional play on words even in antiquity.
What the Clitoris Looks Like
The part you can see is called the glans, a small rounded tip that sits just above the urethral opening, where the inner lips of the vulva meet. On average, the glans is about 5 mm long and 3.4 mm wide, roughly the size of a pea, though this varies from person to person. Some studies put the total visible length (including the portion just beneath the surface) at around 16 mm.
Covering the glans is the clitoral hood, a thin fold of hairless skin that acts like a protective sleeve. It produces mucus, keeps the sensitive tissue underneath from constant friction against clothing, and retracts during arousal to expose more of the glans. The hood is comparable in structure to the foreskin of a penis.
The Hidden Internal Structure
The visible glans is just the tip of a much larger organ. Beneath the skin, the clitoris extends inward with a shaft (called the body) that angles back toward the pelvis, then splits into two wing-shaped legs called crura. These crura run along either side of the vaginal canal and attach to the pelvic bone. There are also two bulbs of tissue that flank the vaginal opening on each side.
Altogether, the internal clitoris is a multiplanar structure that sits deep beneath the labia, the surrounding fat and muscle tissue, and the pubic bone. Anatomical research led by Australian urologist Helen O’Connell revealed that the clitoris has an integral physical relationship with both the urethra and the vaginal wall. This helps explain why stimulation of the vaginal wall can also produce pleasure: the internal portions of the clitoris are being stimulated indirectly from the other side.
Why It’s So Sensitive
The clitoris is densely packed with sensory nerve fibers. A 2022 study from Oregon Health & Science University counted more than 10,000 nerve fibers in the human clitoris, making it one of the most nerve-rich structures in the body relative to its size. That concentration of nerve endings is why even light touch on the glans can produce intense sensation, and why direct contact can sometimes feel too intense for comfort.
How It Responds During Arousal
The clitoris contains erectile tissue, similar in structure to what’s found in a penis. In its resting state, the smooth muscle tissue inside the clitoris stays contracted. During sexual arousal, the body releases a signaling molecule that relaxes the smooth muscle in the clitoral blood vessels. Blood flows in faster than it drains out, causing the internal tissue to swell and stiffen. This engorgement pushes the glans outward, making it more prominent and more sensitive to touch.
The internal bulbs on either side of the vaginal opening also engorge during arousal, which increases sensation throughout the area. This is one reason why arousal before direct clitoral contact typically makes stimulation feel better: the tissue is fuller, the glans is more exposed, and blood flow has heightened nerve responsiveness.
Its Role in Orgasm
The clitoris is the primary source of orgasm for most people with vulvas. Research consistently shows that the majority of women do not reach orgasm from vaginal penetration alone, and that clitoral stimulation, whether direct or indirect, is involved in the vast majority of orgasms. This makes sense given the organ’s anatomy: its internal extensions surround the vaginal canal, meaning many forms of sexual activity involve some degree of clitoral stimulation even when the glans itself isn’t being touched.
Because the clitoris exists solely for pleasure and has no reproductive or urinary function, it was historically overlooked or minimized in medical literature. Detailed anatomical studies of its full internal structure weren’t published until the late 1990s, centuries after comparable research had been done on the penis. That gap in scientific attention is one reason many people are still unfamiliar with how large and complex the organ actually is.